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Microsoft Makes Zork I, II, and III Open Source Under MIT License

Microsoft clarified the license status of Zork I, II, and III code to ensure preservation and eliminate takedown risks, with contributions from Xbox and Activision teams.

  • Microsoft announced today that the source for Zork I, Zork II and Zork III will be open sourced under the MIT License, with Scott Hanselman unveiling the code at Ignite and noting upstream pull requests.
  • In collaboration with Jason Scott, digital archivist of Internet Archive fame, Xbox team, Activision team, and Microsoft Open Source Programs Office submitted upstream pull requests to historical source repositories.
  • Only the source code was released, with commercial packaging, marketing materials, and trademarks remaining proprietary; the announcement suggests compiling with the ZILF compiler into a Z3 file and running it via Windows Frotz or modern Z-Machine interpreters.
  • The release keeps the code available for the ages, Microsoft said, framing it as preservation to place historically important code in the hands of students, teachers and developers while removing prior takedown risk.
  • Previously, the code had been uploaded to GitHub in 2019 by Jason Scott but its license was unresolved, while ownership passed through Infocom, Activision, and Microsoft, with Bill Gates trying to buy the rights in the 1980s.
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GamingOnLinux broke the news in on Thursday, November 20, 2025.
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