I have some ideas that may work for you.
It would be advisory after reading this, if your interested in further ideas and information to message me by clicking the envelope to discuss further.
I know exactly what you mean about CD piracy.
However, do you have these documents as word format?
The best suggestion would be to convert these to PDF documents with some form of protection there.
I would also suggest an installation package which asks for a key that is random generated and lasts for one installation.
I have to rush now but I know of links that could help you, you may find useful..
This is one: click here