What's worse is that the ebooks are horribly crippled. I've had some etextbooks where you can't copy/paste text from it, take screenshots, or even print pages
Have these been pdf files? It's quite common to lock pdf, but just as easy to unlock them. As for different formats, that's were the free software called 'Calibre' comes in. You can easily convert one format to another, change meta-data, add tags, create multiple libraries, etc.
Stitchawl