Surveillance firms that recently attended a US conference are being accused of offering their services to repressive regimes.

"Traditionally communications flowed through phone companies, but consumers are increasingly using communications that operate outwith their jurisdiction. This changes the way interception is carried out … the current method of choice would seem to be spyware, or trojan horses," said Chris Soghoian, a Washington-based surveillance and privacy expert. "There's now a thriving outsourced surveillance industry and they are there to meet the needs and wants of countries from around the world, including those who are more – and less – respectful to human rights."