A co-founder of the outlawed China Democracy Party has been released on parole after six years in prison, partly because of poor health, sources close to the party said yesterday. Zhu Zhengming , 45, was released on Sunday from a Hangzhou prison on a number of conditions. These include not talking to reporters, not publicly expressing opinions and not leaving five designated areas in the capital city of Zhejiang without permission, a source said. He must apply for approval from the Hangzhou Public Security Bureau if he wanted to travel outside the city, the source said, including travel to his home town of Jiangshan, 300km from Hangzhou. 'With the authority's approval, Zhu is now staying with his mother in Jiangshan because he now has nowhere to stay in Hangzhou. But he will need to return to Hangzhou soon,' the source said. Mr Zhu, formerly an engineer at a chemical plant, was sentenced to 10 years' jail in 2000 by the Intermediate People's Court in Hangzhou on charges of subversion after establishing the Zhejiang Preparatory Committee of the China Democracy Party in 1998. At least 50 party members and most of the founding members have been arrested in a crackdown since 1998, said party member Chen Shuqing . Mr Chen said harsh working and living conditions in prison had seen Mr Zhu's health deteriorate, with his shoulder and knee joints giving him the most trouble. 'It's painful whenever it gets cold. That's partly a result of the harder tasks he was assigned to do during the first five years in prison. He looks much older now. A long time in isolation, and hardship, have made him slower.' The China Democracy Party, which advocates a multiparty system for the mainland, was founded by a number of democracy activists and former student leaders of the 1989 Tiananmen Square protests after China signed the United Nations Covenant on Civil and Political Rights.