My employer maintains a small library of technical books for developers. If there's a book we think would be useful for us, we typically buy a number of copies and place them in the library, where the employees can borrow them.
This works well for paperbooks, but with more and more people wanting to use ereaders or tablets to read, we are looking for a solution that solves the same problem, but for ebooks.
Ideally, it would be a solution that works with books from any publisher, and with any ereader/reader-app.
I've seen that Overdrive offers a corporate library service, but from the description I was able to find on their site, it seems rather limited and a bad fit for our needs.
In case it's relevant to the answers, we are located in Norway, but will typically purchase books in english from the US or UK.
PS. If we were to ignore legal issues, we could simply set up calibre on a machine with the web-interface running, and add books when purchased. However, I believe this would at the very least land us in some very grey areas legally speaking.