dsda-doom and conditional licensing
dsda-doom is a modern Doom port with a focus on speedrunning. I want to bring it to Fedora and opened a package review request.
One of the files in the distribution (prboom2/src/gl_vertex.c
) is subject to what seems a standard 3-clause BSD licence, with an additional 4th clause introducing conditional licensing:
** 4. When not used as part of GZDoom or a GZDoom derivative, this code will be
** covered by the terms of the GNU Lesser General Public License as published
** by the Free Software Foundation; either version 2.1 of the License, or (at
** your option) any later version.
While they are both Doom ports, and hence share a common root, dsda-doom is not a GZDoom derivative, so this would mean that the file should be considered GNU LGPL v2.1-licensed in this case.
So my question is: would this conditional licensing be okay in Fedora? And would you agree on this case falling under the "otherwise LGPLv2" clause?
For what it's worth, dsda-doom is a fork of prboom-plus, and the file in question was already present in prboom-plus. I mention this because prboom-plus has been packaged in Fedora for a long time now.