Originally Posted by Dave Berk
pilotbob: I think that no matter how strong the encryption, if you give people an encrypted file, and also access to reader that can read it - it can be decrypted.
Sure, but there is a difference between being able to decrypt/read a file because you have the key (Credit Card/Name or PID) and having the encryption be cracked. Of course for practicle purposes the DRM can be worked around making it useless... which has always been my contention.
As with music on unencrypted CD's pretty much every book printed (since it is on paper) is a DRM free copy of that book. Scanning books is pretty easy these days.