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Old 10-07-2012, 08:24 PM   #8
Man Eating Duck
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Posts: 253
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Join Date: May 2006
Location: Oslo, Norway
Device: Kobo Aura, Sony PRS-650
Quote:
Originally Posted by cybmole View Post
out of curiosity - how easy would it be to build a pottermore type solution i.e. don't try to add any DRM but instead add some unique seller info to each copy sold. could that be a simple scripted process with the right tools ?

i would guess that the sort of folks who will honestly purchase a self published book from an author's own site are not the sort of folks who will then upload it to a torrents site or send copies to everyone in their address book so I would question the need for drm anyway - but I suppose it only takes one bad apple...
While better than DRM in my opinion, it's not really possible to do it securely, as Kovid explains in this post: http://www.mobileread.com/forums/sho...98&postcount=6. Basically any non-randomised watermarking can be easily detected and removed, and absolutely all watermarking will succumb if the user copies the content in some analog way and re-creates it, such as rendering images of the book and OCR-ing them. This will beat even one scheme I saw which encoded information by using different unicode homoglyphs (which has its own set of problems regarding fonts).

There is also the issue that a user can "legitimately" lose his file, for instance I've had my reader stolen on one occasion.
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