Send me a copy of your code and I'll tell you if it's worth stealing.

No, okay, are you asking this question seriously? Really? Cross your heart and hope to die?

Alrighty then. Theoretically, you could compile your code AND use a highly restrictive license AND not ever show anybody your work without an NDA. Others here have excellent arguments against these sorts of things, but it is possible. See the following:

• How can I hide the source for my Perl program?
• How do I compile my script so that it becomes a standalone executable?

If you don't want to do that, then use another language. Perl is NOT for the insecure.

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