You purchased a license for vBulletin. vBulletin Solutions does not sell "full ownership" of the software. You must run vBulletin in accordance with your license.
For an extra fee there is a "Branding Free" license available where you can remove the vBulletin branding from the footer. I don't know if you purchased this option or not, but if you didn't then you are currently in violation of your license.
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