The industry body required Rambus to disclose the existence of patents and patents pending, but the firm "improperly revised" its patents and "subverted the process", and indeed used what it learned from the JEDEC meetings, and from other semiconductor manufacturers participating in the meetings, to revise its pending patents Any products built subsequently by any manufacturers using the JEDEC SDRAM specifications would infringe Rambus patents. Further, claims Hitachi, Rambus has behaved unfairly and uncompetitively by extending the scope of its patent portfolio by unfair licensing agreements and illegal tying arrangements. In a document attached to Hitachi's claims, the firm says that it, Samsung, NEC and others have paid Rambus millions of dollars in fees.