I completely agree with Ed here. Not really a useful tool, IMHO.

If this is because you are selling software, you would be better off writing a "do not touch" clause into your license and explaining this to your clients. Most software out there doesn't bother to encrypt stored procedures because there isn't a lot of value. Even if you do, your clients can decrypt them, and you would need to decrypt them yourself for troubleshooting, just to be sure the client hasn't altered them.