How about including a statement in your code as Larry Wall suggests? Something like.

Perl is the copyright of Larry Wall. This program is the artistic work
+ of Mischief Mayhem and while Larry and the authors of all the other 
+modules that my application uses don't mind me making money from it, 
+I am scared of the idea that you will steal my work, so don't.

Copyright "Some Scared Dude, Inc." 2003
[download]

Or, you could just code like me... hell anyone that tries to use my stuff would just end up scratching his head anyhoo...