Chad Johnson -- Sex Tape Yanked Off Internet

Chad's Johnson is leaving the Internet -- slowly -- courtesy of an angry cease and desist letter fired off to the 2 websites that originally posted the ex-NFL star's sex tape ... TMZ has learned.

Sources close to Chad tell us the sites removed the video late Thursday after they received the letter from his attorneys ... which stated the tape was stolen property which they did not have the right to publish.

We're told CJ's attorneys are now taking aim at several other smaller websites that have posted still images from the sex tape -- and they are threatening legal action against any sites that refuse to pull the material.