Welcome to the fray AAL!
I'll tell you what I know. I've read that no eInk reader can read a DRM'd pdf file. Normal sized pdf files can be hard or impossible to read on a smaller screen anyway. Cybook can read DRM prc files. I don't have a sony so I don't know about them, maybe you could ask in the sony forums and get a good response.
Last edited by cmbs; 04-08-2008 at 04:34 PM.