Enable/disable copy paste (disable part not working)

Hey,
Found a macro for disabling copy/paste on this page:

http://www.vbaexpress.com/kb/getarticle.php?kb_id=373

..but I want to be able to switch it back on again by changing a value in a cell. The macro for copy/pasting is in both ThisWorkbook and in a module.
The macro that I'm looking for is probably easiest seen from my trials (=errors) shown below.

Thanks a lot for your help.

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