Specifically of issue in this case -- there is a wide-open hole in the IA's book hosting system that allows anyone to easily download an Adobe Digital Edition of any book in the archive -- ADE's DRM has been broken for a long time. It takes 2 minutes to go from IA to a full OCR'd PDF. The result is that there are a LOT of decrypted PDFs in the wild that carry the Internet Archive logo on the very first page.

I am for DRM because it could enable something like the IA to host and lend books without violating author's privledge. The IA's implementation is foolish and, I think, carries the intent to allow exploitation.