Sorry if this is a "wet blanket," but once potential customers have got your material in any format, can't they do whatever they want with it...even if it means copying your docs onto their own computers by hand?
Granted that copyright protection isn't much more than an illusion, but isn't it enough?
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
