There is a product I use for script licensing (
PHPAudit) which is in my eyes a great product and I use it for my own scripts, with version 2 around the corner I was talking with the developer about possibly creating one with vbulletin integration.
He is interested if the demand is there so I am posting this here for the vb community to get some input (Jelsoft...you may want to look into this for vbulletin). This is of course "assuming we can get it to work as expected"...
Let me know.