I'm not the other single vote - that voted in favor of drm over watermark - but against the general trend here that's my opinion too. If you think you should protect your files then do it "as properly" as possible and not some half-hearted way. Maybe I have come to this opinion because I've made better experiences with drm than with watermarks. At the moment, we can manage drm, but the word of "watermark" brings back worst memories of pdf files similar to these lines:
Originally Posted by rkomar
I assume it wouldn't produce a faint image over the text on every page, would it?