I secure every report in Adobe Acrobat for that reason. No copy, no paste or changes (a past attorney/client recommendation).
Hey Roy, I'm sure you know, but you any doc that can be locked, can be unlocked. I was going to upload a changed version of your report, but decided that would be rude to do without your permission. I'm sure it would keep out most, but don't rely on it 100%. Cheers.