Let's say DRM'ed ebooks all go away.
Oh, there go contemporary, copyrighted-ebook lending libraries.
No DRM, no ebook libraries.
Notice the technology is called Digital Rights *Management* not Digital Use Limitation.
DRM is just a tool and a feature of business models. Don't blame the tool, which can be used to enable as well as disable functionality, for its misuse by idiots in the BPHs.
(Okay, so I'm feeling contrarian today; carry on...)
