Copyright Treaty requires nations party to the treaties to enact laws against DRM circumvention. There are risks to using circumvention software or other methods to bypass Internet censorship. Article 11 prohibits circumvention of technological locks. Security hackers are people involved with circumvention of computer security. Most of the tested sites in the anonymizers and circumvention tools category were also blocked. Methods for gaining access ranged from using an alternate DNS server to installing circumvention software. Other AACS circumvention programs have become available, like DVDFab HD Decrypter. Most circumvention tools combine these two mechanisms. Egypt is constructing an underground steel barrier to prevent circumvention of the blockade through tunnels. Doing so may be a circumvention of Apple's technical protection measures. He also profited from importing goods in circumvention of Napoleon's continental blockade. Measures and estimates of circumvention tool adoption have reported widely divergent results. Estimates of adoption of circumvention tools vary substantially and are disputed. Reproduction in such conditions is only possible through the circumvention of infertility by medical intervention. This breaking down, and circumvention of existing marketing structures follows postmodernist theory in cinema.