McDonalds sued an Irish franchise called Supermac's, claiming it violated their trademark on the Big Mac. That turns out to have been a legal mistake, and resulted in McDonalds losing the Big Mac trademark. The legal decision seems to have turned on the fact that the Big Mac is a product, not a chain, and Supermac's is a chain, not a burger.
Other posts: https://community.isc2.org/t5/forums/recentpostspage/user-id/1324864413
This message may or may not be governed by the terms of http://www.noticebored.com/html/cisspforumfaq.html#Friday or https://blogs.securiteam.com/index.php/archives/1468