I was recently interested in purchasing eBooks from Morgan Kaufmann. "The UX Book: Process and Guidelines for Ensuring a Quality User Experience" costs $89.95 USD; surely for that insane price your eBook would be DRM-free, right? Wrong. Both ePub and PDF use Adobe Adept (Inept) DRM.

You can try to find the Kindle/iBook version, but as this article points out "its a license to read" ... and very often, the quality of the digital conversion is very poor, especially for literature with illustrations.

DRM-free PDF is the only way for me.