Yes I should have said something about copyright. I want to be able to display any public domain epub as a website.
DRM is a subject I know little about for ebooks. I'll have to do some reading. I'm sure I could learn a lot right here. I know Amazon and Apple and Sony have their own proprietary ways of making books not readable, unless the client purchases a key.
Websites are easy to hide behind a password barrier. But for epub that's a bit of a problem, it seems:
"The EPUB3 specification does not define any method for digital rights management. The Readium Foundation is working on lightweight DRM:
http://readium.org/projects/readium-lcp, otherwise you will need to find a commercial DRM solution."