the present invention discloses several methods to strengthen the integrity of entities , messages , and processing related to content distribution as defined by the open mobile alliance digital rights management . the methods use techniques related to the trusted computing group specifications . a first embodiment uses tcg techniques to verify platform and drm software integrity or trustworthiness , both with and without modifications to the drm rights object acquisition protocol and drm content format specifications . a second embodiment uses tcg techniques to strengthen the integrity of roap messages , constituent information , and processing without changing the existing roap protocol . a third embodiment uses tcg techniques to strengthen the integrity of the roap messages , information , and processing with some changes to the existing roap protocol .