Jon Bruner interviews Tim O’Reilly for Forbes Magazine. O’Reilly Media doesn’t put DRM on any of its books, he explains why:
People who don’t pay you generally wouldn’t have paid you anyway. We’re delighted when people who can’t afford our books don’t pay us for them, if they go out and do something useful with that information.
I think having faith in that basic logic of the market is important. Besides, DRM interferes with the user experience. It makes it much harder to have people adopt your product.
The lack of DRM is one of the reasons I purchase books from O’Reilly directly. It feels like you’re actually buying something — they’ll also give it to you in whatever format you want and will email when there’s an update. If you keep an eye on their twitter feed, they offer decent discounts.