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Originally Posted by rogerVA
How will DRM books be noted as such on sites like Amazon? And how do I tell if books on my Kindle 3 are DRM? And is there a guide here for stripping the DRM from your books?
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1) The secret code phrase which Amazon unofficially uses for letting you know that a Kindle book is DRM-free is "Simultaneous Device Usage: Unlimited" in the Product Details on the Amazon catalogue page. If you don't see it at all, or you see a number instead of "Unlimited", then it's DRM.
Kobo, on the other hand, now tells you outright whether a downloadable book is DRM-free or not when you go to the product page. But they only seem to have a very tiny portion of their catalogue qualifying and there's currently no way to search to filter for them.
2) If you try opening your hardware Kindle Mobi files with another reader (Kindle for PC, Calibre without the plugins, Kindle Previewer, Stanza, Mobipocket Reader, etc.) and you get an error message, that means that they're DRM. Someone may perhaps have written a script to check the metadata to speed this process up.
3) Other people have already pointed you in the right direction off MR, but I have to add that if you're going to strip, strip early and strip often. Amazon has a decided tendency to tweak their firmware, software, and file format to break the enabling tools from time to time.
Also, keep a backup copy of the original DRM file and unlocking keys along with the stripped version, because sometimes the tools get fixed to account for interpretation errors that might have previously lead to faulty or damaged output.
Hope this helps.