Worst part for me is that even libraries, who want to promote openness and reading, are perfectly comfortable with delivering books using Adobe's horrible DRM delivery solution.
Libraries have to play in the rules the publishers give them or else they get cut off from the supply of ebooks. They already have to pay more for the ebooks that expire after a certain number of loans.
Yeah, it's a major misconception to state that they're happy about it. Talk to librarians after hours and they will rant. (And most of us have personal DRM stripped libraries).
At least Adobe DRM is trivially easy to break. Right click in the Adobe software and it has a "open document storage location" option. Then drop that DRM loaded PDF into Calibre and you get a free and clear PDF in your library. At that point I go back to the library and hit the return button.
Why not get a DRM-free epub off the net in the first place?
In some cases these are not available. For instance, archive.org has many books that don't seem to be available anywhere else.