Quote:
Originally Posted by Sil_liS
I thought that this exists already. I think that torrents use something like that, so that even when the filename is changed it is still recognized as the same file.
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Usually torrents use a MD5 checksum on each file or block to make sure the torrent does not break while spreading it around.
I did not mean torrents, I meant the e-book file itself. Of course technology exists to digitally sign files so that you know that they are from who it says they are. I was not aware that e.g. epub files have that included in the standard.