diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
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--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,674 @@
+                   GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    {one line to give the program's name and a brief idea of what it does.}
+    Copyright (C) {year}  {name of author}
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    {project}  Copyright (C) {year}  {fullname}
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/src/main/java/de/fabianonline/telegram_backup/CommandLineController.java b/src/main/java/de/fabianonline/telegram_backup/CommandLineController.java
index e42f6de..3046b3a 100644
--- a/src/main/java/de/fabianonline/telegram_backup/CommandLineController.java
+++ b/src/main/java/de/fabianonline/telegram_backup/CommandLineController.java
@@ -18,11 +18,16 @@ public class CommandLineController {
 	
 	public CommandLineController(CommandLineOptions options) {
 		if (options.cmd_version) {
-			System.out.println("Telegram_Backup v" + Config.APP_APPVER);
-			System.out.println("by Fabian Schlenz");
+			System.out.println("Telegram_Backup version " + Config.APP_APPVER + ", Copyright (C) 2016 Fabian Schlenz");
+			System.out.println("Telegram_Backup comes with ABSOLUTELY NO WARRANTY. This is free software, and you are");
+			System.out.println("welcome to redistribute it under certain conditions; run it with '--license' for details.");
 			System.exit(0);
 		} else if (options.cmd_help) {
 			this.show_help();
+			System.exit(0);
+		} else if (options.cmd_license) {
+			this.show_license();
+			System.exit(0);
 		}
 		
 		if (options.target != null) {
@@ -126,8 +131,7 @@ public class CommandLineController {
 		System.out.println("  -t, --target <x>             Target directory for the files.");
 		System.out.println("  -e, --export <format>        Export the database. Valid formats are:");
 		System.out.println("                               html - Creates HTML files.");
-		
-		System.exit(0);
+		System.out.println("      --license                Displays the license of this program.");
 	}
 	
 	private void list_accounts() {
@@ -150,4 +154,629 @@ public class CommandLineController {
 		System.exit(1);
 	}
 	
+	public static void show_license() {
+		System.out.println(
+			"GNU GENERAL PUBLIC LICENSE\n" +
+			"   Version 3, 29 June 2007\n" +
+			"\n" +
+			"Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>\n" +
+			"Everyone is permitted to copy and distribute verbatim copies\n" +
+			"of this license document, but changing it is not allowed.\n" +
+			"\n" +
+			"        Preamble\n" +
+			"\n" +
+			"The GNU General Public License is a free, copyleft license for\n" +
+			"software and other kinds of works.\n" +
+			"\n" +
+			"The licenses for most software and other practical works are designed\n" +
+			"to take away your freedom to share and change the works.  By contrast,\n" +
+			"the GNU General Public License is intended to guarantee your freedom to\n" +
+			"share and change all versions of a program--to make sure it remains free\n" +
+			"software for all its users.  We, the Free Software Foundation, use the\n" +
+			"GNU General Public License for most of our software; it applies also to\n" +
+			"any other work released this way by its authors.  You can apply it to\n" +
+			"your programs, too.\n" +
+			"\n" +
+			"When we speak of free software, we are referring to freedom, not\n" +
+			"price.  Our General Public Licenses are designed to make sure that you\n" +
+			"have the freedom to distribute copies of free software (and charge for\n" +
+			"them if you wish), that you receive source code or can get it if you\n" +
+			"want it, that you can change the software or use pieces of it in new\n" +
+			"free programs, and that you know you can do these things.\n" +
+			"\n" +
+			"To protect your rights, we need to prevent others from denying you\n" +
+			"these rights or asking you to surrender the rights.  Therefore, you have\n" +
+			"certain responsibilities if you distribute copies of the software, or if\n" +
+			"you modify it: responsibilities to respect the freedom of others.\n" +
+			"\n" +
+			"For example, if you distribute copies of such a program, whether\n" +
+			"gratis or for a fee, you must pass on to the recipients the same\n" +
+			"freedoms that you received.  You must make sure that they, too, receive\n" +
+			"or can get the source code.  And you must show them these terms so they\n" +
+			"know their rights.\n" +
+			"\n" +
+			"Developers that use the GNU GPL protect your rights with two steps:\n" +
+			"(1) assert copyright on the software, and (2) offer you this License\n" +
+			"giving you legal permission to copy, distribute and/or modify it.\n" +
+			"\n" +
+			"For the developers' and authors' protection, the GPL clearly explains\n" +
+			"that there is no warranty for this free software.  For both users' and\n" +
+			"authors' sake, the GPL requires that modified versions be marked as\n" +
+			"changed, so that their problems will not be attributed erroneously to\n" +
+			"authors of previous versions.\n" +
+			"\n" +
+			"Some devices are designed to deny users access to install or run\n" +
+			"modified versions of the software inside them, although the manufacturer\n" +
+			"can do so.  This is fundamentally incompatible with the aim of\n" +
+			"protecting users' freedom to change the software.  The systematic\n" +
+			"pattern of such abuse occurs in the area of products for individuals to\n" +
+			"use, which is precisely where it is most unacceptable.  Therefore, we\n" +
+			"have designed this version of the GPL to prohibit the practice for those\n" +
+			"products.  If such problems arise substantially in other domains, we\n" +
+			"stand ready to extend this provision to those domains in future versions\n" +
+			"of the GPL, as needed to protect the freedom of users.\n" +
+			"\n" +
+			"Finally, every program is threatened constantly by software patents.\n" +
+			"States should not allow patents to restrict development and use of\n" +
+			"software on general-purpose computers, but in those that do, we wish to\n" +
+			"avoid the special danger that patents applied to a free program could\n" +
+			"make it effectively proprietary.  To prevent this, the GPL assures that\n" +
+			"patents cannot be used to render the program non-free.\n" +
+			"\n" +
+			"The precise terms and conditions for copying, distribution and\n" +
+			"modification follow.\n" +
+			"\n" +
+			"        TERMS AND CONDITIONS\n" +
+			"\n" +
+			"0. Definitions.\n" +
+			"\n" +
+			"\"This License\" refers to version 3 of the GNU General Public License.\n" +
+			"\n" +
+			"\"Copyright\" also means copyright-like laws that apply to other kinds of\n" +
+			"works, such as semiconductor masks.\n" +
+			"\n" +
+			"\"The Program\" refers to any copyrightable work licensed under this\n" +
+			"License.  Each licensee is addressed as \"you\".  \"Licensees\" and\n" +
+			"\"recipients\" may be individuals or organizations.\n" +
+			"\n" +
+			"To \"modify\" a work means to copy from or adapt all or part of the work\n" +
+			"in a fashion requiring copyright permission, other than the making of an\n" +
+			"exact copy.  The resulting work is called a \"modified version\" of the\n" +
+			"earlier work or a work \"based on\" the earlier work.\n" +
+			"\n" +
+			"A \"covered work\" means either the unmodified Program or a work based\n" +
+			"on the Program.\n" +
+			"\n" +
+			"To \"propagate\" a work means to do anything with it that, without\n" +
+			"permission, would make you directly or secondarily liable for\n" +
+			"infringement under applicable copyright law, except executing it on a\n" +
+			"computer or modifying a private copy.  Propagation includes copying,\n" +
+			"distribution (with or without modification), making available to the\n" +
+			"public, and in some countries other activities as well.\n" +
+			"\n" +
+			"To \"convey\" a work means any kind of propagation that enables other\n" +
+			"parties to make or receive copies.  Mere interaction with a user through\n" +
+			"a computer network, with no transfer of a copy, is not conveying.\n" +
+			"\n" +
+			"An interactive user interface displays \"Appropriate Legal Notices\"\n" +
+			"to the extent that it includes a convenient and prominently visible\n" +
+			"feature that (1) displays an appropriate copyright notice, and (2)\n" +
+			"tells the user that there is no warranty for the work (except to the\n" +
+			"extent that warranties are provided), that licensees may convey the\n" +
+			"work under this License, and how to view a copy of this License.  If\n" +
+			"the interface presents a list of user commands or options, such as a\n" +
+			"menu, a prominent item in the list meets this criterion.\n" +
+			"\n" +
+			"1. Source Code.\n" +
+			"\n" +
+			"The \"source code\" for a work means the preferred form of the work\n" +
+			"for making modifications to it.  \"Object code\" means any non-source\n" +
+			"form of a work.\n" +
+			"\n" +
+			"A \"Standard Interface\" means an interface that either is an official\n" +
+			"standard defined by a recognized standards body, or, in the case of\n" +
+			"interfaces specified for a particular programming language, one that\n" +
+			"is widely used among developers working in that language.\n" +
+			"\n" +
+			"The \"System Libraries\" of an executable work include anything, other\n" +
+			"than the work as a whole, that (a) is included in the normal form of\n" +
+			"packaging a Major Component, but which is not part of that Major\n" +
+			"Component, and (b) serves only to enable use of the work with that\n" +
+			"Major Component, or to implement a Standard Interface for which an\n" +
+			"implementation is available to the public in source code form.  A\n" +
+			"\"Major Component\", in this context, means a major essential component\n" +
+			"(kernel, window system, and so on) of the specific operating system\n" +
+			"(if any) on which the executable work runs, or a compiler used to\n" +
+			"produce the work, or an object code interpreter used to run it.\n" +
+			"\n" +
+			"The \"Corresponding Source\" for a work in object code form means all\n" +
+			"the source code needed to generate, install, and (for an executable\n" +
+			"work) run the object code and to modify the work, including scripts to\n" +
+			"control those activities.  However, it does not include the work's\n" +
+			"System Libraries, or general-purpose tools or generally available free\n" +
+			"programs which are used unmodified in performing those activities but\n" +
+			"which are not part of the work.  For example, Corresponding Source\n" +
+			"includes interface definition files associated with source files for\n" +
+			"the work, and the source code for shared libraries and dynamically\n" +
+			"linked subprograms that the work is specifically designed to require,\n" +
+			"such as by intimate data communication or control flow between those\n" +
+			"subprograms and other parts of the work.\n" +
+			"\n" +
+			"The Corresponding Source need not include anything that users\n" +
+			"can regenerate automatically from other parts of the Corresponding\n" +
+			"Source.\n" +
+			"\n" +
+			"The Corresponding Source for a work in source code form is that\n" +
+			"same work.\n" +
+			"\n" +
+			"2. Basic Permissions.\n" +
+			"\n" +
+			"All rights granted under this License are granted for the term of\n" +
+			"copyright on the Program, and are irrevocable provided the stated\n" +
+			"conditions are met.  This License explicitly affirms your unlimited\n" +
+			"permission to run the unmodified Program.  The output from running a\n" +
+			"covered work is covered by this License only if the output, given its\n" +
+			"content, constitutes a covered work.  This License acknowledges your\n" +
+			"rights of fair use or other equivalent, as provided by copyright law.\n" +
+			"\n" +
+			"You may make, run and propagate covered works that you do not\n" +
+			"convey, without conditions so long as your license otherwise remains\n" +
+			"in force.  You may convey covered works to others for the sole purpose\n" +
+			"of having them make modifications exclusively for you, or provide you\n" +
+			"with facilities for running those works, provided that you comply with\n" +
+			"the terms of this License in conveying all material for which you do\n" +
+			"not control copyright.  Those thus making or running the covered works\n" +
+			"for you must do so exclusively on your behalf, under your direction\n" +
+			"and control, on terms that prohibit them from making any copies of\n" +
+			"your copyrighted material outside their relationship with you.\n" +
+			"\n" +
+			"Conveying under any other circumstances is permitted solely under\n" +
+			"the conditions stated below.  Sublicensing is not allowed; section 10\n" +
+			"makes it unnecessary.\n" +
+			"\n" +
+			"3. Protecting Users' Legal Rights From Anti-Circumvention Law.\n" +
+			"\n" +
+			"No covered work shall be deemed part of an effective technological\n" +
+			"measure under any applicable law fulfilling obligations under article\n" +
+			"11 of the WIPO copyright treaty adopted on 20 December 1996, or\n" +
+			"similar laws prohibiting or restricting circumvention of such\n" +
+			"measures.\n" +
+			"\n" +
+			"When you convey a covered work, you waive any legal power to forbid\n" +
+			"circumvention of technological measures to the extent such circumvention\n" +
+			"is effected by exercising rights under this License with respect to\n" +
+			"the covered work, and you disclaim any intention to limit operation or\n" +
+			"modification of the work as a means of enforcing, against the work's\n" +
+			"users, your or third parties' legal rights to forbid circumvention of\n" +
+			"technological measures.\n" +
+			"\n" +
+			"4. Conveying Verbatim Copies.\n" +
+			"\n" +
+			"You may convey verbatim copies of the Program's source code as you\n" +
+			"receive it, in any medium, provided that you conspicuously and\n" +
+			"appropriately publish on each copy an appropriate copyright notice;\n" +
+			"keep intact all notices stating that this License and any\n" +
+			"non-permissive terms added in accord with section 7 apply to the code;\n" +
+			"keep intact all notices of the absence of any warranty; and give all\n" +
+			"recipients a copy of this License along with the Program.\n" +
+			"\n" +
+			"You may charge any price or no price for each copy that you convey,\n" +
+			"and you may offer support or warranty protection for a fee.\n" +
+			"\n" +
+			"5. Conveying Modified Source Versions.\n" +
+			"\n" +
+			"You may convey a work based on the Program, or the modifications to\n" +
+			"produce it from the Program, in the form of source code under the\n" +
+			"terms of section 4, provided that you also meet all of these conditions:\n" +
+			"\n" +
+			"a) The work must carry prominent notices stating that you modified\n" +
+			"it, and giving a relevant date.\n" +
+			"\n" +
+			"b) The work must carry prominent notices stating that it is\n" +
+			"released under this License and any conditions added under section\n" +
+			"7.  This requirement modifies the requirement in section 4 to\n" +
+			"\"keep intact all notices\".\n" +
+			"\n" +
+			"c) You must license the entire work, as a whole, under this\n" +
+			"License to anyone who comes into possession of a copy.  This\n" +
+			"License will therefore apply, along with any applicable section 7\n" +
+			"additional terms, to the whole of the work, and all its parts,\n" +
+			"regardless of how they are packaged.  This License gives no\n" +
+			"permission to license the work in any other way, but it does not\n" +
+			"invalidate such permission if you have separately received it.\n" +
+			"\n" +
+			"d) If the work has interactive user interfaces, each must display\n" +
+			"Appropriate Legal Notices; however, if the Program has interactive\n" +
+			"interfaces that do not display Appropriate Legal Notices, your\n" +
+			"work need not make them do so.\n" +
+			"\n" +
+			"A compilation of a covered work with other separate and independent\n" +
+			"works, which are not by their nature extensions of the covered work,\n" +
+			"and which are not combined with it such as to form a larger program,\n" +
+			"in or on a volume of a storage or distribution medium, is called an\n" +
+			"\"aggregate\" if the compilation and its resulting copyright are not\n" +
+			"used to limit the access or legal rights of the compilation's users\n" +
+			"beyond what the individual works permit.  Inclusion of a covered work\n" +
+			"in an aggregate does not cause this License to apply to the other\n" +
+			"parts of the aggregate.\n" +
+			"\n" +
+			"6. Conveying Non-Source Forms.\n" +
+			"\n" +
+			"You may convey a covered work in object code form under the terms\n" +
+			"of sections 4 and 5, provided that you also convey the\n" +
+			"machine-readable Corresponding Source under the terms of this License,\n" +
+			"in one of these ways:\n" +
+			"\n" +
+			"a) Convey the object code in, or embodied in, a physical product\n" +
+			"(including a physical distribution medium), accompanied by the\n" +
+			"Corresponding Source fixed on a durable physical medium\n" +
+			"customarily used for software interchange.\n" +
+			"\n" +
+			"b) Convey the object code in, or embodied in, a physical product\n" +
+			"(including a physical distribution medium), accompanied by a\n" +
+			"written offer, valid for at least three years and valid for as\n" +
+			"long as you offer spare parts or customer support for that product\n" +
+			"model, to give anyone who possesses the object code either (1) a\n" +
+			"copy of the Corresponding Source for all the software in the\n" +
+			"product that is covered by this License, on a durable physical\n" +
+			"medium customarily used for software interchange, for a price no\n" +
+			"more than your reasonable cost of physically performing this\n" +
+			"conveying of source, or (2) access to copy the\n" +
+			"Corresponding Source from a network server at no charge.\n" +
+			"\n" +
+			"c) Convey individual copies of the object code with a copy of the\n" +
+			"written offer to provide the Corresponding Source.  This\n" +
+			"alternative is allowed only occasionally and noncommercially, and\n" +
+			"only if you received the object code with such an offer, in accord\n" +
+			"with subsection 6b.\n" +
+			"\n" +
+			"d) Convey the object code by offering access from a designated\n" +
+			"place (gratis or for a charge), and offer equivalent access to the\n" +
+			"Corresponding Source in the same way through the same place at no\n" +
+			"further charge.  You need not require recipients to copy the\n" +
+			"Corresponding Source along with the object code.  If the place to\n" +
+			"copy the object code is a network server, the Corresponding Source\n" +
+			"may be on a different server (operated by you or a third party)\n" +
+			"that supports equivalent copying facilities, provided you maintain\n" +
+			"clear directions next to the object code saying where to find the\n" +
+			"Corresponding Source.  Regardless of what server hosts the\n" +
+			"Corresponding Source, you remain obligated to ensure that it is\n" +
+			"available for as long as needed to satisfy these requirements.\n" +
+			"\n" +
+			"e) Convey the object code using peer-to-peer transmission, provided\n" +
+			"you inform other peers where the object code and Corresponding\n" +
+			"Source of the work are being offered to the general public at no\n" +
+			"charge under subsection 6d.\n" +
+			"\n" +
+			"A separable portion of the object code, whose source code is excluded\n" +
+			"from the Corresponding Source as a System Library, need not be\n" +
+			"included in conveying the object code work.\n" +
+			"\n" +
+			"A \"User Product\" is either (1) a \"consumer product\", which means any\n" +
+			"tangible personal property which is normally used for personal, family,\n" +
+			"or household purposes, or (2) anything designed or sold for incorporation\n" +
+			"into a dwelling.  In determining whether a product is a consumer product,\n" +
+			"doubtful cases shall be resolved in favor of coverage.  For a particular\n" +
+			"product received by a particular user, \"normally used\" refers to a\n" +
+			"typical or common use of that class of product, regardless of the status\n" +
+			"of the particular user or of the way in which the particular user\n" +
+			"actually uses, or expects or is expected to use, the product.  A product\n" +
+			"is a consumer product regardless of whether the product has substantial\n" +
+			"commercial, industrial or non-consumer uses, unless such uses represent\n" +
+			"the only significant mode of use of the product.\n" +
+			"\n" +
+			"\"Installation Information\" for a User Product means any methods,\n" +
+			"procedures, authorization keys, or other information required to install\n" +
+			"and execute modified versions of a covered work in that User Product from\n" +
+			"a modified version of its Corresponding Source.  The information must\n" +
+			"suffice to ensure that the continued functioning of the modified object\n" +
+			"code is in no case prevented or interfered with solely because\n" +
+			"modification has been made.\n" +
+			"\n" +
+			"If you convey an object code work under this section in, or with, or\n" +
+			"specifically for use in, a User Product, and the conveying occurs as\n" +
+			"part of a transaction in which the right of possession and use of the\n" +
+			"User Product is transferred to the recipient in perpetuity or for a\n" +
+			"fixed term (regardless of how the transaction is characterized), the\n" +
+			"Corresponding Source conveyed under this section must be accompanied\n" +
+			"by the Installation Information.  But this requirement does not apply\n" +
+			"if neither you nor any third party retains the ability to install\n" +
+			"modified object code on the User Product (for example, the work has\n" +
+			"been installed in ROM).\n" +
+			"\n" +
+			"The requirement to provide Installation Information does not include a\n" +
+			"requirement to continue to provide support service, warranty, or updates\n" +
+			"for a work that has been modified or installed by the recipient, or for\n" +
+			"the User Product in which it has been modified or installed.  Access to a\n" +
+			"network may be denied when the modification itself materially and\n" +
+			"adversely affects the operation of the network or violates the rules and\n" +
+			"protocols for communication across the network.\n" +
+			"\n" +
+			"Corresponding Source conveyed, and Installation Information provided,\n" +
+			"in accord with this section must be in a format that is publicly\n" +
+			"documented (and with an implementation available to the public in\n" +
+			"source code form), and must require no special password or key for\n" +
+			"unpacking, reading or copying.\n" +
+			"\n" +
+			"7. Additional Terms.\n" +
+			"\n" +
+			"\"Additional permissions\" are terms that supplement the terms of this\n" +
+			"License by making exceptions from one or more of its conditions.\n" +
+			"Additional permissions that are applicable to the entire Program shall\n" +
+			"be treated as though they were included in this License, to the extent\n" +
+			"that they are valid under applicable law.  If additional permissions\n" +
+			"apply only to part of the Program, that part may be used separately\n" +
+			"under those permissions, but the entire Program remains governed by\n" +
+			"this License without regard to the additional permissions.\n" +
+			"\n" +
+			"When you convey a copy of a covered work, you may at your option\n" +
+			"remove any additional permissions from that copy, or from any part of\n" +
+			"it.  (Additional permissions may be written to require their own\n" +
+			"removal in certain cases when you modify the work.)  You may place\n" +
+			"additional permissions on material, added by you to a covered work,\n" +
+			"for which you have or can give appropriate copyright permission.\n" +
+			"\n" +
+			"Notwithstanding any other provision of this License, for material you\n" +
+			"add to a covered work, you may (if authorized by the copyright holders of\n" +
+			"that material) supplement the terms of this License with terms:\n" +
+			"\n" +
+			"a) Disclaiming warranty or limiting liability differently from the\n" +
+			"terms of sections 15 and 16 of this License; or\n" +
+			"\n" +
+			"b) Requiring preservation of specified reasonable legal notices or\n" +
+			"author attributions in that material or in the Appropriate Legal\n" +
+			"Notices displayed by works containing it; or\n" +
+			"\n" +
+			"c) Prohibiting misrepresentation of the origin of that material, or\n" +
+			"requiring that modified versions of such material be marked in\n" +
+			"reasonable ways as different from the original version; or\n" +
+			"\n" +
+			"d) Limiting the use for publicity purposes of names of licensors or\n" +
+			"authors of the material; or\n" +
+			"\n" +
+			"e) Declining to grant rights under trademark law for use of some\n" +
+			"trade names, trademarks, or service marks; or\n" +
+			"\n" +
+			"f) Requiring indemnification of licensors and authors of that\n" +
+			"material by anyone who conveys the material (or modified versions of\n" +
+			"it) with contractual assumptions of liability to the recipient, for\n" +
+			"any liability that these contractual assumptions directly impose on\n" +
+			"those licensors and authors.\n" +
+			"\n" +
+			"All other non-permissive additional terms are considered \"further\n" +
+			"restrictions\" within the meaning of section 10.  If the Program as you\n" +
+			"received it, or any part of it, contains a notice stating that it is\n" +
+			"governed by this License along with a term that is a further\n" +
+			"restriction, you may remove that term.  If a license document contains\n" +
+			"a further restriction but permits relicensing or conveying under this\n" +
+			"License, you may add to a covered work material governed by the terms\n" +
+			"of that license document, provided that the further restriction does\n" +
+			"not survive such relicensing or conveying.\n" +
+			"\n" +
+			"If you add terms to a covered work in accord with this section, you\n" +
+			"must place, in the relevant source files, a statement of the\n" +
+			"additional terms that apply to those files, or a notice indicating\n" +
+			"where to find the applicable terms.\n" +
+			"\n" +
+			"Additional terms, permissive or non-permissive, may be stated in the\n" +
+			"form of a separately written license, or stated as exceptions;\n" +
+			"the above requirements apply either way.\n" +
+			"\n" +
+			"8. Termination.\n" +
+			"\n" +
+			"You may not propagate or modify a covered work except as expressly\n" +
+			"provided under this License.  Any attempt otherwise to propagate or\n" +
+			"modify it is void, and will automatically terminate your rights under\n" +
+			"this License (including any patent licenses granted under the third\n" +
+			"paragraph of section 11).\n" +
+			"\n" +
+			"However, if you cease all violation of this License, then your\n" +
+			"license from a particular copyright holder is reinstated (a)\n" +
+			"provisionally, unless and until the copyright holder explicitly and\n" +
+			"finally terminates your license, and (b) permanently, if the copyright\n" +
+			"holder fails to notify you of the violation by some reasonable means\n" +
+			"prior to 60 days after the cessation.\n" +
+			"\n" +
+			"Moreover, your license from a particular copyright holder is\n" +
+			"reinstated permanently if the copyright holder notifies you of the\n" +
+			"violation by some reasonable means, this is the first time you have\n" +
+			"received notice of violation of this License (for any work) from that\n" +
+			"copyright holder, and you cure the violation prior to 30 days after\n" +
+			"your receipt of the notice.\n" +
+			"\n" +
+			"Termination of your rights under this section does not terminate the\n" +
+			"licenses of parties who have received copies or rights from you under\n" +
+			"this License.  If your rights have been terminated and not permanently\n" +
+			"reinstated, you do not qualify to receive new licenses for the same\n" +
+			"material under section 10.\n" +
+			"\n" +
+			"9. Acceptance Not Required for Having Copies.\n" +
+			"\n" +
+			"You are not required to accept this License in order to receive or\n" +
+			"run a copy of the Program.  Ancillary propagation of a covered work\n" +
+			"occurring solely as a consequence of using peer-to-peer transmission\n" +
+			"to receive a copy likewise does not require acceptance.  However,\n" +
+			"nothing other than this License grants you permission to propagate or\n" +
+			"modify any covered work.  These actions infringe copyright if you do\n" +
+			"not accept this License.  Therefore, by modifying or propagating a\n" +
+			"covered work, you indicate your acceptance of this License to do so.\n" +
+			"\n" +
+			"10. Automatic Licensing of Downstream Recipients.\n" +
+			"\n" +
+			"Each time you convey a covered work, the recipient automatically\n" +
+			"receives a license from the original licensors, to run, modify and\n" +
+			"propagate that work, subject to this License.  You are not responsible\n" +
+			"for enforcing compliance by third parties with this License.\n" +
+			"\n" +
+			"An \"entity transaction\" is a transaction transferring control of an\n" +
+			"organization, or substantially all assets of one, or subdividing an\n" +
+			"organization, or merging organizations.  If propagation of a covered\n" +
+			"work results from an entity transaction, each party to that\n" +
+			"transaction who receives a copy of the work also receives whatever\n" +
+			"licenses to the work the party's predecessor in interest had or could\n" +
+			"give under the previous paragraph, plus a right to possession of the\n" +
+			"Corresponding Source of the work from the predecessor in interest, if\n" +
+			"the predecessor has it or can get it with reasonable efforts.\n" +
+			"\n" +
+			"You may not impose any further restrictions on the exercise of the\n" +
+			"rights granted or affirmed under this License.  For example, you may\n" +
+			"not impose a license fee, royalty, or other charge for exercise of\n" +
+			"rights granted under this License, and you may not initiate litigation\n" +
+			"(including a cross-claim or counterclaim in a lawsuit) alleging that\n" +
+			"any patent claim is infringed by making, using, selling, offering for\n" +
+			"sale, or importing the Program or any portion of it.\n" +
+			"\n" +
+			"11. Patents.\n" +
+			"\n" +
+			"A \"contributor\" is a copyright holder who authorizes use under this\n" +
+			"License of the Program or a work on which the Program is based.  The\n" +
+			"work thus licensed is called the contributor's \"contributor version\".\n" +
+			"\n" +
+			"A contributor's \"essential patent claims\" are all patent claims\n" +
+			"owned or controlled by the contributor, whether already acquired or\n" +
+			"hereafter acquired, that would be infringed by some manner, permitted\n" +
+			"by this License, of making, using, or selling its contributor version,\n" +
+			"but do not include claims that would be infringed only as a\n" +
+			"consequence of further modification of the contributor version.  For\n" +
+			"purposes of this definition, \"control\" includes the right to grant\n" +
+			"patent sublicenses in a manner consistent with the requirements of\n" +
+			"this License.\n" +
+			"\n" +
+			"Each contributor grants you a non-exclusive, worldwide, royalty-free\n" +
+			"patent license under the contributor's essential patent claims, to\n" +
+			"make, use, sell, offer for sale, import and otherwise run, modify and\n" +
+			"propagate the contents of its contributor version.\n" +
+			"\n" +
+			"In the following three paragraphs, a \"patent license\" is any express\n" +
+			"agreement or commitment, however denominated, not to enforce a patent\n" +
+			"(such as an express permission to practice a patent or covenant not to\n" +
+			"sue for patent infringement).  To \"grant\" such a patent license to a\n" +
+			"party means to make such an agreement or commitment not to enforce a\n" +
+			"patent against the party.\n" +
+			"\n" +
+			"If you convey a covered work, knowingly relying on a patent license,\n" +
+			"and the Corresponding Source of the work is not available for anyone\n" +
+			"to copy, free of charge and under the terms of this License, through a\n" +
+			"publicly available network server or other readily accessible means,\n" +
+			"then you must either (1) cause the Corresponding Source to be so\n" +
+			"available, or (2) arrange to deprive yourself of the benefit of the\n" +
+			"patent license for this particular work, or (3) arrange, in a manner\n" +
+			"consistent with the requirements of this License, to extend the patent\n" +
+			"license to downstream recipients.  \"Knowingly relying\" means you have\n" +
+			"actual knowledge that, but for the patent license, your conveying the\n" +
+			"covered work in a country, or your recipient's use of the covered work\n" +
+			"in a country, would infringe one or more identifiable patents in that\n" +
+			"country that you have reason to believe are valid.\n" +
+			"\n" +
+			"If, pursuant to or in connection with a single transaction or\n" +
+			"arrangement, you convey, or propagate by procuring conveyance of, a\n" +
+			"covered work, and grant a patent license to some of the parties\n" +
+			"receiving the covered work authorizing them to use, propagate, modify\n" +
+			"or convey a specific copy of the covered work, then the patent license\n" +
+			"you grant is automatically extended to all recipients of the covered\n" +
+			"work and works based on it.\n" +
+			"\n" +
+			"A patent license is \"discriminatory\" if it does not include within\n" +
+			"the scope of its coverage, prohibits the exercise of, or is\n" +
+			"conditioned on the non-exercise of one or more of the rights that are\n" +
+			"specifically granted under this License.  You may not convey a covered\n" +
+			"work if you are a party to an arrangement with a third party that is\n" +
+			"in the business of distributing software, under which you make payment\n" +
+			"to the third party based on the extent of your activity of conveying\n" +
+			"the work, and under which the third party grants, to any of the\n" +
+			"parties who would receive the covered work from you, a discriminatory\n" +
+			"patent license (a) in connection with copies of the covered work\n" +
+			"conveyed by you (or copies made from those copies), or (b) primarily\n" +
+			"for and in connection with specific products or compilations that\n" +
+			"contain the covered work, unless you entered into that arrangement,\n" +
+			"or that patent license was granted, prior to 28 March 2007.\n" +
+			"\n" +
+			"Nothing in this License shall be construed as excluding or limiting\n" +
+			"any implied license or other defenses to infringement that may\n" +
+			"otherwise be available to you under applicable patent law.\n" +
+			"\n" +
+			"12. No Surrender of Others' Freedom.\n" +
+			"\n" +
+			"If conditions are imposed on you (whether by court order, agreement or\n" +
+			"otherwise) that contradict the conditions of this License, they do not\n" +
+			"excuse you from the conditions of this License.  If you cannot convey a\n" +
+			"covered work so as to satisfy simultaneously your obligations under this\n" +
+			"License and any other pertinent obligations, then as a consequence you may\n" +
+			"not convey it at all.  For example, if you agree to terms that obligate you\n" +
+			"to collect a royalty for further conveying from those to whom you convey\n" +
+			"the Program, the only way you could satisfy both those terms and this\n" +
+			"License would be to refrain entirely from conveying the Program.\n" +
+			"\n" +
+			"13. Use with the GNU Affero General Public License.\n" +
+			"\n" +
+			"Notwithstanding any other provision of this License, you have\n" +
+			"permission to link or combine any covered work with a work licensed\n" +
+			"under version 3 of the GNU Affero General Public License into a single\n" +
+			"combined work, and to convey the resulting work.  The terms of this\n" +
+			"License will continue to apply to the part which is the covered work,\n" +
+			"but the special requirements of the GNU Affero General Public License,\n" +
+			"section 13, concerning interaction through a network will apply to the\n" +
+			"combination as such.\n" +
+			"\n" +
+			"14. Revised Versions of this License.\n" +
+			"\n" +
+			"The Free Software Foundation may publish revised and/or new versions of\n" +
+			"the GNU General Public License from time to time.  Such new versions will\n" +
+			"be similar in spirit to the present version, but may differ in detail to\n" +
+			"address new problems or concerns.\n" +
+			"\n" +
+			"Each version is given a distinguishing version number.  If the\n" +
+			"Program specifies that a certain numbered version of the GNU General\n" +
+			"Public License \"or any later version\" applies to it, you have the\n" +
+			"option of following the terms and conditions either of that numbered\n" +
+			"version or of any later version published by the Free Software\n" +
+			"Foundation.  If the Program does not specify a version number of the\n" +
+			"GNU General Public License, you may choose any version ever published\n" +
+			"by the Free Software Foundation.\n" +
+			"\n" +
+			"If the Program specifies that a proxy can decide which future\n" +
+			"versions of the GNU General Public License can be used, that proxy's\n" +
+			"public statement of acceptance of a version permanently authorizes you\n" +
+			"to choose that version for the Program.\n" +
+			"\n" +
+			"Later license versions may give you additional or different\n" +
+			"permissions.  However, no additional obligations are imposed on any\n" +
+			"author or copyright holder as a result of your choosing to follow a\n" +
+			"later version.\n" +
+			"\n" +
+			"15. Disclaimer of Warranty.\n" +
+			"\n" +
+			"THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY\n" +
+			"APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT\n" +
+			"HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM \"AS IS\" WITHOUT WARRANTY\n" +
+			"OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,\n" +
+			"THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR\n" +
+			"PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM\n" +
+			"IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF\n" +
+			"ALL NECESSARY SERVICING, REPAIR OR CORRECTION.\n" +
+			"\n" +
+			"16. Limitation of Liability.\n" +
+			"\n" +
+			"IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING\n" +
+			"WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS\n" +
+			"THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY\n" +
+			"GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE\n" +
+			"USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF\n" +
+			"DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD\n" +
+			"PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),\n" +
+			"EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF\n" +
+			"SUCH DAMAGES.\n" +
+			"\n" +
+			"17. Interpretation of Sections 15 and 16.\n" +
+			"\n" +
+			"If the disclaimer of warranty and limitation of liability provided\n" +
+			"above cannot be given local legal effect according to their terms,\n" +
+			"reviewing courts shall apply local law that most closely approximates\n" +
+			"an absolute waiver of all civil liability in connection with the\n" +
+			"Program, unless a warranty or assumption of liability accompanies a\n" +
+			"copy of the Program in return for a fee.\n" +
+			"\n" +
+			"        END OF TERMS AND CONDITIONS");	
+	}
+	
 }
diff --git a/src/main/java/de/fabianonline/telegram_backup/CommandLineOptions.java b/src/main/java/de/fabianonline/telegram_backup/CommandLineOptions.java
index c732148..87c73f8 100644
--- a/src/main/java/de/fabianonline/telegram_backup/CommandLineOptions.java
+++ b/src/main/java/de/fabianonline/telegram_backup/CommandLineOptions.java
@@ -11,6 +11,7 @@ class CommandLineOptions {
 	public String target = null;
 	public boolean cmd_version = false;
 	public String export = null;
+	public boolean cmd_license = false;
 
 	public CommandLineOptions(String[] args) {
 		String last_cmd = null;
@@ -65,6 +66,9 @@ class CommandLineOptions {
 				
 				case "-e": case "--export":
 					last_cmd = "--export";               continue;
+				
+				case "--license":
+					this.cmd_license = true;             break;
 					
 				default:
 					throw new RuntimeException("Unknown command " + arg);