I am trying 2 alternatives:
This is my code:>
Instead of trying to control the users key commands(it is possible some browsers may detect this as malicious code) you can disable selection of text on your page. Although this will not avoid data being copied as stated in your comments.
Place this in your
tags and the user cannot select text on your page.
Found on http://myblog-log.blogspot.com/2007/06/disable-copy-and-paste.html