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Its hard to believe that you have completely disregarded the actual content of my posts and given a condescending response based on your opinion that since half the world runs it then my point is invalid.

I was merely asking for a little clarification on a point about vbulletin, yet you give a scathing and flippant response to "ask mysql."

Edit: I've now done a little research on the issue, and it seems I did have a valid point, although a little outdated

Originally Posted by Zak Greant - MySql AB

As for the issue of whether vBulletin is or is not a derivative work of MySQL: I don't know. If a program could be a derivative work of another program, then only a court can definitively decide if a derivative work has been formed.

We always recommend that proprietary programs use the proprietarily licensed version of MySQL. This recommendation is simple, understandable, pays our bills and is never wrong. We also encourage vendors to consider switching their applications to Free/Open licensing as well so that they can use MySQL free of cost.

In addition to the technical issues around the licensing, there are the business issues - most proprietary developer are pleased to license the software, or enter into other business arrangements, if there is significant benefit to them for the cost.

Originally Posted by Scott MacVicar - VB dev

Thanks for you reply Zak.

A member of staff has already been in touch with Jennifer Casey regarding licensing.

In short, it seems that it is an issue, but negotiations a few years ago have resolved it

Source: http://www.vbulletin.com/forum/showthread.php?t=107079