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Original Copyright 1987 Sierra On-Line, Inc
From Wikipedia:
Released in 1987 using Sierra's Adventure Game Interpreter parser engine, Police Quest cast the player as Sonny Bonds, a 15 year veteran police officer in the fictional town of Lytton, California. . As the game progresses, he goes from patrol to temporary narcotics detective and finally undercover, tracking "The Death Angel", a murderous drug dealer named Jessie Bains.
Sierra and its referenced games are all copyright © Activision Blizzard.