> The Doom source code was released December 23, 1997, initially under a not-for-profit license. Later, permission was granted by John Carmack to re-release the source code under the GNU General Public License on October 3, 1999, albeit only via an email conversation.
And then about 24 years later, the licence file was updated in the git repo. :)
id Doom -> Linux Doom -> DosDoom -> Boom -> MBF -> Eternity [0]
0. https://doomwiki.org/wiki/James_Haley_(Quasar)
> The Doom source code was released December 23, 1997, initially under a not-for-profit license. Later, permission was granted by John Carmack to re-release the source code under the GNU General Public License on October 3, 1999, albeit only via an email conversation.
And then about 24 years later, the licence file was updated in the git repo. :)