[Paul M]

It would actually be against the vbulletin licence terms to run your forum.

You may not use the Software to engage in or allow others to engage in any illegal activity where the Software is accessed and used. You may not use the Software to engage in any activity that will violate the rights of third parties, including, without limitation, through the use, public display, public performance, reproduction, distribution, or modification of communications or materials that infringe copyrights, trademarks, publicity rights, privacy rights, other proprietary rights, or rights against defamation of third parties.