Dumb uses of DRM
Princeton University has introduced a very knuckleheaded way to distribute textbooks electronically. I don't mind getting copies of books electronically, but a 33% discount is not nearly enough of a compensation for not being able to print or copy between computers. And they expire in 5 months?!? I've got textbooks that I still refer to on occassion and I graduated in the early 90s.
I do have some books that I've purchased in DRM and I'm happy with the value provided (even though you can print them). The last ebook I bought was six bucks vs. sixty-some for the paperback version. That's the kind of discount I'd expect for a DRM protected book - if I like it, I might buy the hardcopy anyway because it is easier to read and reference.