 Still, there are reasons to be skeptical of the validity of the proposed universal entropy bounds, and the corresponding Holographic Principle. Unruh and Wald (1982), in response to Bekenstein's postulated entropy bound, argued convincingly that there is a less ad hoc way to save the Generalized Second Law, namely by exploiting the Unruh effect (for an explanation of which, see  note 16).[15]  Flanagan et al. (2000), moreover, have offered strong arguments that the validity of the Generalized Second Law is independent of Bousso's proposed entropy bound (widely thought to be superior to Bekenstein's original one), thus removing much of the primary historical and conceptual motivation for the Holographic Principle. 