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http://en.wikipedia.org/wiki/The_Tetris_Company

TTC drew attention in the late 90s when it attempted to remove freeware and shareware versions of Tetris from the market by sending out cease-and-desist letters claiming both trademark and copyright infringement.[7] Creators of Tetris clones claimed that the company had no valid legal basis to restrict tetromino games that did not infringe on the Tetris name trademark, since copyright "look-and-feel"