Yes, the adult guard works. The only bad thing for me is that I pick up an independent local broadcaster OTA. There is no information on the EPG so it is always listed as 'NR/AO'. If I lock out skinemax, that broadcaster is locked out too. I just use the four number password, though to get around it.question on the Cinemax- will the adult guard work for the Skinemax part of Cinemax?