Time spent in forums: 6 Months 1 Day 19 h 19 m 2 sec
Reputation Power: 4192
Being able to prevent text selection can be useful for drag-and-drop scripts, but using it to prevent copy-and-pasting of text is just user-hostile. People can often just do a "Select All" and then a "Copy" anyway. And usually they could view the page's source to access the text as well.
The web is a free (well mostly) and open medium. Get used to it.
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Time spent in forums: 1 Month 2 Weeks 1 Day 17 h 49 m 4 sec
Reputation Power: 813
there is no technical way to prevent people from "stealing" your content. None.
So forget that "copyright script". All it does is irritate and annoy legitimate users and give the bad guys a good laugh. Actually, when a website doesn't allow me to do what I want to do, I'm out and won't come back. So this script might actually make you lose users.
What you're trying to do is kind of a contradiction in terms: When you publish something, it's public. Anybody can view and use the data in any way they want.
I understand your concerns, and it really is annoying to see content pop up somewhere else. But you're fighting on the wrong end.
By the way, the script also doesn't work in Chrome. Throw it away.