I would think that if customary royalty payments (based on future sales of infringing product) were to be forthcoming, the disclosure would be simply that and nothing more - "ongoing royalty payments will be forthcoming based on future sales of infringing product by certain entites/a certain entity".

Saying more would not only likely violate the CC, but would also not be in PTSC/TPL's best interest, as it would reveal details (e.g., royalty amount per infringing unit sold) that could adversely affect future negotiations.

JMHO,

SGE