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README.md: Explain EmptyMessages.

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Fabian Schlenz 2017-12-10 19:53:51 +01:00
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@ -89,6 +89,15 @@ containing all your messages and other data. The folder `files` contains all
media files, named after the ID of the message they belong to. Last but not
least the folder `export` contains exported data.
### What are EmptyMessages? Why are there so many messages?
If you are a member of a normal group (non-supergroup), all messages sent to
that group are being copied to your personal messages at Telegram's servers.
If you later leave this group, those messages are being deleted at Telegram,
but since all messages are continuously numbered, you can't simply delete
them because that would leave a hole in your message numbers. So these
messages are instead replaced by EmptyMessages - those things contain zero
information, they are just saying "here was a message but it was deleted".
## Attribution
This tool uses libraries from other developers which are covered by other licenses,