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But I see your problem. It happens to me all the time. You could build something that searches Google for a unique phrase from each of your pages. I do this manually every now and then and it has helped me 'catch' a large number of webmasters that had copied my text without permission.
For all the people that take snippets of your content without a link, there are probably just as many doing it legitimately. Disabling text selection could add up to a lot of lost exposure.
I suppose the key question is whether you get ongoing natural inbound linkage from those who quote your articles. If virtually all are unattributed ripoffs, then maybe the step you propose makes sense.
Any halfway competent ripoff artist, though, can find any number of ways to get the text without highlighting, "View Source" being the first one that comes to mind.
Besides, your browsers lose some functionality, too.
mic089 said: Does anyone know of any disadvantages to disabling text selection?
That said, such a script can be amazingly helpful if the brain-power of your scrapers isn't terribly impressive:
I have an educational site, and educators were continually scraping my lessons to sell as their own work. (They were hired to write and teach online courses, so, yes, they were getting paid for what they plagiarised.) These "professionals" sneer down their noses at me, since I have "only" a master's degree in math, years of teaching and tutoring experience, and a proven "track record" for quality work, but I don't have an "education" degree. They will plainly state that I'm not "qualified" (as they claim to be) to teach in the high-school classroom-- though apparently I'm good enough to steal from...?!?
Anyway, these "rocket scientists", these "highly qualified" "professionals", had no idea how to get around the no-highlight script once I'd installed it on my site, and the number of incidents of scraping went through the floor immediately upon the script's installation.
I've since had to remove it from my own site (for the sake of the afore-mentioned "Search" script), and I get annoyed when I'm hindered by it on other sites. But I can't honestly say that a "no right click" or "no highlight" script is an entirely bad thing.
Just my opinion, of course; I could be wrong....