Economic Freedom and its Measurement. The Encyclopedia of Public Choice 2. Springer: 161–171. 2004. ISBN 978-0-7923-8607-0. Surjit S. Bhalla. Freedom and
sticking to a non-proprietary and open solution,Conax公司兼承科技技術有『自由選擇』(freedomofchoice)的概念,這包括: 透過完全開放、公平和 and non-discriminatory 授權政策,為機上盒製造業者提供機上盒對Conax加密的支援。