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Another thing I've seen people use is Tynt at http://www.tynt.com/. If you copy and paste something, it automatically adds a "see more from" and the URL to the end of the copy text that shows up when you paste it. A higher-level question is regarding HOW people are copying your content. Are they going to you website and copying and pasting it, or are they grabbing it from your RSS feed? If they're scraping it via RSS or a non-manual means, doing things with right-clicks won't help much.

Thanks Miriam for the follow up, I appreciate it!

Such a broad question - What industry, what country, what is your budget, what is your website and most importantly - what is your product? There are a lot of good linkbuilders are around here, but if you have a crap website and a crap product, linkbuilding isnt really going to get you ROI It should cost anything from free to $1,000,000 a month (by which i mean - it depends, there are no quick, easy answers here) But I would quote 2 days work to investigate you industry, website etc before doing any linkbuilding - so thats minimum $1000 before I start - how does that fit your budget?