3 ms·
They almost certainly are for some sources. And probably with your unique user id to work out who leaked the copy on to torrent sites. The way to check this is
by Polylactic_acid 6y ago
They almost certainly are for some sources. And probably with your unique user id to work out who leaked the copy on to torrent sites.
The way to check this is pretty easy though, get 2 users to bit for bit compare their books to work out if they are identical.
- young_unixer 6y agoOpen the book in Evince, Print to PDF. Bam, your book is now anonymous.
- probably_wrong 6y agoI am not following your line of reasoning correctly. The watermarking is done using characters that look different from each other. Printing the book will not change those characters, and therefore it is still possible to extract the original information. Harder, but not impossible. For this information to be lost, Evince would have to print the book in a crappy font that uses a single symbol for both. Which is possible, but I think it's not what you were going for.
- young_unixer 6y agoThe hash won't be the same, which is what matters the most. They won't have people manually reviewing the punctuation to catch infringement, and it's highly probable that Evince printing to PDF will mess the whole internal structure, so it's hard to automate it.
- Polylactic_acid 6y agoIf you just print it then that defeats the point. They don't care about individual copies, they want to find who is stripping DRM and posting books on torrent trackers.
- ceejayoz 6y agoHow likely are you to notice if your resulting PDF had a specific unique pattern of zero-width spaces embedded with it? Or if a few curly quotes aren't curly? Let alone scenarios like the cover JPEG having stenographic info in it...