This issue has been discussed more times than I can count. No information except for the domain name (which you are required to provide anyway) and the license number are stored. There is no way for anyone from Jelsoft to log into your Admin CP nor is there any hole for hackers to exploit.
This issue is also covered in the
license. If you wish to discuss this issue further please contact
john@vbulletin.com with your concerns.
I am also going to remove the code from the post, for obvious reasons.