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Originally Posted by KevinH
Please note that individual graphics are often used to "watermark" some epubs in order to originally identify who the book was sold too.
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Hmmm... do you happen to recall which sites/stores you noticed this from?
I don't believe any major retailers do such a thing, and just host the same exact file to send to all customers.
All I recall is reading about it every so often, like in this The Digital Reader article:
https://the-digital-reader.com/2016/...watermark-drm/
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In addition to adding a unique serial number to the names of files found inside the Epub ebook, Booxtream also embeds the original buyer's name and email on the title page as well as in a footer at the end of each chapter. The digital watermarks can also be found in image metadata and the CSS file, and there's a time stamp which records the specific time the original ebook was downloaded.
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Quote:
Originally Posted by KevinH
I have found 2 books that used multiple ways to hide their "watermarking". Never understood why on earth you would hide a watermark but .... could this be one of those rare cases?
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I acquired another copy and compared it to my Kobo version. Nope, exact same image.
If anything, these kinds of things just cause savvy pirates to purchase 2 separate copies, then compare both files together to see exactly what's changed.
Quote:
Originally Posted by KevinH
Never understood why on earth you would hide a watermark
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Used all the time in those huge movie leaks and catching pirates who release screeners (like the movies they send to judges for award shows):
https://torrentfreak.com/replacing-d...irates-190126/
https://torrentfreak.com/oscars-scre...me-low-190226/
Definitely much easier to hide robust watermarks in images/video though... but ebooks?
Things like Calibre EPUB->EPUB or MOBI->EPUB conversions can remove a lot of that cruft.