While most of the renditions referred to in the documents appear to have been C.I.A. operations, at least one was claimed to have been carried out by MI-6.

“The rendition program was all about handing over these significant figures related to Al Qaeda so they could torture them and get the information they wanted,” said Peter Bouckaert, emergencies director of Human Rights Watch, who studied the documents in the intelligence headquarters in downtown Tripoli.

The documents cover 2002 to 2007, with many of them concentrated in late 2003 and 2004, when Moussa Koussa was head of the External Security Organization. (Mr. Koussa was most recently Libya’s foreign minister.)

The speech that appears to have been drafted for Colonel Qaddafi was found in the C.I.A. folder and appears to have been sent just before Christmas in 2003. The one-page speech seems intended to depict the Libyan dictator in a positive light. It concluded, using the revolutionary name for the Libyan government: “At a time when the world is celebrating the birth of Jesus, and as a token of our contributions towards a world full of peace, security, stability and compassion, the Great Jamhariya presents its honest call for a W.M.D.-free zone in the Middle East,” referring to weapons of mass destruction.

The flurry of communications about renditions are dated after Libya’s renouncement of its weapons program. In several of the cases, the documents explicitly talked about having a friendly country arrest a suspect, and then suggested aircraft would be sent to pick the suspect up and deliver him to the Libyans for questioning. One document included a list of 89 questions for the Libyans to ask a suspect.

While some of the documents warned Libyan authorities to respect such detainees’ human rights, the C.I.A. nonetheless turned them over for interrogation to a Libyan service with a well-known history of brutality.