The security problem with DRM isn't a matter of the strength of the encryption. The problem is that the end user has the decryption key. This is probably why Amazon are trying to hid the PIDs they give to Kindles and iPhone/iTouch.
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Originally Posted by cerement
I wonder why more publishers haven't looked at public-key encryption (like PGP or GPG) for their DRM needs. Open source, provides strong encryption, AND serves as a means of identification through digital signatures.
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