Anyone who wants the data bad enough, can get the data they want. It's like any burglary prevention system - the thieves can still get in if they want it bad enough. But, considering that a multitude of people don't know a web address from an e-mail address, some of the above methods can be used. Using the PDF sounds like the best option to me, since noone can mess with your data that way, and you can suppress print on it. But, anyone who wants to, can spend their time doing screen shots and recreating what you have, so it all depends on how sensitive this data is, and why you'd even want to protect it from printing in the first place.