fonts/gdouros: correct license to unfree

[emilazy]

Motivation for this change

I assume the licence for these fonts changed at some point, but the current licensing conditions are actually rather byzantine and definitely non-Free. They actually prohibit redistribution, so the existing Hydra builds of these packages (example) are a liability; I'm not sure who (if anyone) would be able to purge them.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[grahamc]

License at last update: https://web.archive.org/web/20181228102831/http://users.teilar.gr/%7Eg1951d/License.pdf

[emilazy]

Looks like the noncommercial requirement was added between January and March 2018; the licence forbidding redistribution first appeared in the April 20 2018 archive, so any builds on Hydra from then onwards are problematic.

[ajs124]

Is there any statement anywhere from George Douros, the maintainer of these fonts, on this?

I found multiple other projects (arch linux, some homebrew thing, some math font thing(?)) that stumbled upon this license change, but none of the discussions had any reasoning from the guy.

While he most likely had/has some reason for this license, he might also not be aware of what this change in license means. Maybe someone should try and reach out to him to figure out if this is actually what he intended and if he might want to change the licenses again.

[emilazy]

I haven't found anything to that effect. I'm happy to try emailing and asking if he's considered fully free font licences, but unfortunately I doubt you go from "do anything" to "do anything noncommercial" to "do almost nothing" without intending the restrictions. If a new version under a free licence is released, that would be great, but the current package version's licence should probably be fixed until then anyway.

[emilazy]

@GrahamcOfBorg build aegan aegyptus akkadian assyrian eemusic maya symbola textfonts unidings

[lukateras]

https://hydra.nixos.org won't build unfree packages regardless of this attribute.

[lukateras]

LGTM otherwise.

[lukateras]

Would like to merge this and #79681 on Feb 28 9 pm UTC. cc @grahamc

[emilazy]

does this need backporting to 20.03 too?

[lukateras]

does this need backporting to 20.03 too?

Actually, yes! (e.g. see #81337)