First off let me say by doing that you are going to annoy many more of your website users that have no intent on stealing any of your content then are ever going to actually try to steal content. Doing this is not going to prevent people from stealing it, just deter the ones who don't know what they are doing. If someone wants it they will get it one way or another.

Anyway if you really have you heart set on doing it ...

A Google search for something like "javascript +disable select" or "javascript +disable copy" will turn up multiple websites with the code you need.

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