If you tokenize the code, you could encode the license info in an obscure reg key as Rad suggests. I posted a code/decode UDF a while back that would work for you. It should sufficiently obfuscate any registry entry you make. You can even use part of the timestamp of the file for a key value for the encoding. This way, if anyone manipulates the file, it will not decode the key properly.

Look at the CODEC UDF

Glenn
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Actually I am a Rocket Scientist! \:D