If you haven't seen Sharing by xkcd, it's worth a look.

In the strip, some friends discover a tree with a USB port sticking out of it. Upon connecting a computer to it, they discover an ebook -- Shel Silverstein's The Giving Tree, as a DRM'd Amazon Kindle file.

The book cannot be opened and sharing is not allowed.

Via xkcd

"I spent more time trying to get an audible.com audio book playing than it took to listen to the book. I have lost every other piece of DRM-locked music I have paid for."

See the guide to DRM-free living for services that don't implement DRM.