Keep in mind that if you want people to be able to print it, there's no stopping anyone from scanning the printed version and then OCR-ing the text and copying that.
In addition, a lot of screen-capture software (e.g., Snaggit) will let you access the text in a screen capture.
Plus, there are a number of 3rd-party PDF software out there that can bypass security (and no, I do not know which ones).
Simply, using the security tools that Acrobat provides is sort of like putting locks on your doors—it mostly keeps the honest or slightly dishonest people out. If someone wants in, they will get in.
Wish I could tell you otherwise, but that's the way things are.