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Congratulations Paul - that's an excellent site but can I play Devil's Advocate here?

I know the site has to pay for itself but by charging the authors I think you'll be scaring away the very content providers you need. The normal business model is that content providers are actually paid or at least encouranged to provide the content free, while users pay a small subscription to use the facility.

Creating a key is a massive undertaking and putting it on the site would also be a lot of work. Alternatively, any key ceator could easily write the key in (say) Word and save it as an HTML structure or a PDF file and make it available to everyone through a normal website.

Anyway, just me opinion - please take it as constructive criticism :)