You need to read the entire sentence from the 7/6/07 PR:

"Bull joins a roster of 17 other global system manufacturers that have purchased licenses over the past 18 months."

AMD and Intel signed up more than 18 months ago. 17 + 2 = 19 (Bull makes 20).

From the 6/18/07 PR you quote:

"The court's decision clearly demonstrates why 19 prestigious global companies have already purchased MMP Licenses."

As of that date, 19 was correct.

Hope this helps.

SGE