Protecting your work?

Question

I've decided to make a pdf document and sell it online. Problem is, I dont know what is the best way to protect it from being stolen. Putting a password on it wont work because if it gets distributed, they will send others the password to open it. I've seen other methods from pdf's i've bought online which just dont work & are really unpopular, such as encrypting the document with the buyers bank details so that they wouldnt dare distribute it themselves.

Is there anyway I can do this?

Answer 1

Get Adobe 8 Professional (not free), that's what others used to lock their files.