"A 'fully paid up' license in a patent settlement means that the licensee is free to operate under that patent without the payment of any additional money. In essence, all royalties have been paid in advance. There may or may not be additional obligations that continue to run despite the absence of ongoing monetary obligations."
The bolded portion was exactly my point of view - seemingly shared by other people not associated with this deal and therefore probably not trying to irritate you.
A "fully paid up" license is very common today. This is now the basis of IBM's licensing program and most technology transfer centers.