Hi Des
I only saw this thread now. As Andy said, it is likely that there are tools available to create 'access-controlled' e-books and as always, there will be a way around them. However, I'm not familiar with any existing tools of that nature.
I am in the software industry, and developing an application like that could make for an interesting project. If you'd like to discuss it further, please give me a shout.
Cheers,
Riaan
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