Wp Protection Documents

Hi there
I made a web site with wp and he wanted me to do these if that possible?
Can you guys help me out for that i wrote what he wanted from me!
He is tax agency and he wants to male his documents protected but he also want these:
“i want our website to allow on payment, only the view level that you are able to see now in that link. I do not want to permit download, copy paste print even after payment, but the subscriber can view say, 20 times or something like that”
I will appreciate if some of you guys help me oit on that?

How much you are required for that!
I have low budget for that?