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In OTL Nintendo sued Tengen in:
Tengen unsuccessfully tried to negotiate with Nintendo for a less restrictive license (Nintendo restricted their licensees to releasing only five games per year, and required their games to be NES-exclusive for two years). Nintendo refused, so in December 1987 Tengen agreed to the standard licensing terms. In 1988, Tengen released its first and only three cartridges licensed through Nintendo—RBI Baseball, Pac-Man and Gauntlet. Meanwhile, Tengen secretly worked to bypass Nintendo's lock-out chip called 10NES that gave it control over which games were published for the NES. While numerous manufacturers managed to override this chip by zapping it with a voltage spike, Tengen engineers feared this could potentially damage NES consoles and expose them to unnecessary liability. The other problem was that Nintendo made frequent modifications to the NES to prevent this technique from working. Instead the company chose to reverse engineer the chip and decipher the code required to unlock it. However, the engineers were unable to do so, and the launch date for its first batch of games was rapidly approaching.

With time running short, Tengen turned to the United States Copyright Office. Its lawyers contacted the government office to request a copy of the Nintendo lock-out program, claiming that the company needed it for potential litigation against Nintendo. Once obtained, it used the program to create its own chip that would unlock the NES. When Tengen launched the unlicensed versions of its games, Nintendo immediately sued Tengen for copyright and patent infringement. This began a series of lawsuits between the companies which would not be settled until 1994.

Tengen faced another court challenge with Nintendo in 1989 in copyright controversy over Tetris. Tengen lost this suit as well and was forced to recall what was estimated to be hundreds of thousands of unsold cartridges (having sold only about 50,000).
Do you have any ideas which Tengen would have won the lawsuit?
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