Agreed - there's going to be a technical way around any restrictions you might put in place, so (I think) you ought to focus on the most common abuses you can think of. I know Acrobat's no-copy and no-print features can be bypassed, in different ways depending on the restrictions put on by the author - I've done that myself.
But how much time and effort is the average Joe going to spend on that? That's what I was referring to - normal use, not some pipe-dream of total security. I still say Acrobat is just fine for that purpose. If you can not tolerate any possible re-use of your content, then you'd be better off not putting it out there at all.