Microsoft has announce that the Zork Trilogy will be Open Source from now one. According to the posting on their website:
Today, we’re preserving a cornerstone of gaming history that is near and dear to our hearts. Together, Microsoft’s Open Source Programs Office (OSPO), Team Xbox, and Activision are making Zork I, Zork II, and Zork III available under the MIT License. Our goal is simple: to place historically important code in the hands of students, teachers, and developers so they can study it, learn from it, and, perhaps most importantly, play it.
https://opensource.microsoft.com/blog/2025/11/20/preserving-code-that-shaped-generations-zork-i-ii-and-iii-go-open-source
The source code for tthe Zork Trilogy in addition to many other Infocom type games is available on the Internet Archive at: https://github.com/historicalsource?tab=repositories
