For the first two US releases, the titles used "Warrior" instead of the original Japanese "Quest". This was due to "Dragon Quest"s North American name being changed due to a trademark conflict with the role-playing game "DragonQuest", which was published by Simulation Publications in the 1980s until the company's bankruptcy in 1982 and purchase by TSR, Inc., which then published it as an alternate line to "Dungeons & Dragons" until 1987. In 2003, Square Enix registered the "Dragon Quest" trademark in the US, making the "Dragon Warrior" name obsolete.