"The default copyright laws applies meaning that the autor retains all rights to the source code and no one may reproduce, distribute, or create derivative works from the work."
Good luck
That says "you grant each User of GitHub a nonexclusive, worldwide license to use, display, and perform Your Content through the GitHub Service and to reproduce Your Content solely on GitHub as permitted through GitHub's functionality".
In other words, without an explicit license you can do whatever you like with publically viewable content as long as it runs via GitHub.
[1] https://docs.github.com/en/site-policy/github-terms/github-t...
That is extremely limiting...
Are you referring to the license from 1997 here..? Or have there been other source code licenses which pages like Wikipedia and the DOOM wiki don't mention?
EDIT: someone else in this thread linked this: https://doom.fandom.com/wiki/Doom_Source_License. And:
> The DSL is significantly more restrictive than the GNU GPL, and as such is incompatible with it. For example, any form of commercial exploitation is forbidden. Heavy restrictions apply to the distribution of copies of the source code; the license grants permission only for the distribution of portions of the code for "educational use". The DSL is not an Open Source license (under the Open Source Definition) or a Free Software license.
Surely that's not a very attractive alternative to the GPL?