I know it may sound silly, but i worked for a client that seems not willing to pay me, but is making money with his website…i still have access to the ftp…so, i’m not going to tear down the website if he doesnt pay, but i would at least protect my code that i gave him…so in case i’m sure that he cant resell or use again…
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http://www.zend.com/en/products/guard/
If you code for your client in PHP, this will prevent reverse engineering, and you can set the application to expire after a certain amount of time. There are numerous other licensing options available.
I think you have a deeper problem though, you should really talk to your client or get a third-party mediator to resolve this. At the very least, you should receive a deposit. Contracts will also give you some legal leverage, so you should have signed one before you started work.