DRM schemes get defeated. Latest to get cracked: The Kindle:

it looks like an Israeli hacker named Labba has done just that. For the time being, the hack, which allows you to convert your legally obtained e-books to unencrypted PDF files, is available as a Python script. We're sure that the process will be streamlined for us civilians soon enough

The script for this is already written: a year or two of futile updates "to protect the authors", as each DRM update gets broken, During that time, there'll be wailing and gnashing of teeth. Finally, DRM will be removed, and Amazon will announce this as if it's what they always wanted to do. Just like music, and movies will follows as well. Rinse, repeat...