Gary McKinnon has lost his appeal against extradition to the US on hacking charges. To hear the US government tell it, Gary McKinnon is a dangerous man, and should be extradited back to America to stand trial. One US prosecutor has accused him of committing the biggest military computer hack of all time". But Mr McKinnon has said his motives were harmless and innocent. He was, he says, simply looking for information on UFOs. If found guilty, Mr McKinnon could face decades in US jail, and fines of close to $2m. Mr McKinnon said that ... he never acted with malicious intent. But he did admit that he hacked into dozens of US government computer systems. In fact, he calmly detailed just how easy it was to access extremely sensitive information. But for some, his method of hacking is not nearly so interesting as his reason for doing it. Mr McKinnon told the BBC that he is convinced that the United States government is withholding critical information about Unidentified Flying Objects. His supporters say that instead of prosecuting him, the US government should thank him for pointing out massive computer security lapses. As for his quest to find evidence of a UFO cover-up, Mr McKinnon has said that he found some circumstantial evidence online ... including what he said are photos with what he speculated were alien spacecraft airbrushed out of the picture.