ePub encryption possible?
Hi, I am new to the forum and will introduce myself properly when I'm not in such a crunch for time. Meanwhile....
I'm using OSX (10.5.8) and CS5 (will soon upgrade to 5.5). My client has an aviation manual that I will be converting from InDesign to an ebook (fixed-layout .epub file, via 5.5 and CircularFlo software) so he can sell either through iBookstore or his own website. But he wants to protect the manual with a key so that only designated buyers---i.e. his trained students----have access to it, and so it can't be easily shared. (Ideally, buyers would only have to use the key once, not every time.) At what stage does such encryption happen (layout? conversion? distribution?). This must be common practice---for military, medical, scientific materials and so on----anyone know where can I learn more about how to do it? This is my first foray into encryption. Thanks!