OK, I'll be the one to ask the stupid question.
I've seen sites, especially gallery sites that disable copy and paste for images so that you have to purchase images from the website. You can't just copy the sample images. I get that.

But why would you stop someone from copying the material in your textbox/textarea? You shouldn't have much info in a form field, so even if you "protect it" someone can still easily type it. I guess I don't understand what real advantage you hope to get by locking it down, and as you can see, for a solution that works cross browser you virtually HAVE to use Javascript and it's ugly. That's a lot of work for a solution that's not going to work very well.
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