Use SPDX-License-Identifier for add-ons as well

[MartijnKaijser]

For Kodi code we have switched to the SPDX-License-Identifier which makes it easier to identify what licenses are used. Perhaps this is a good idea as well for add-ons. Just as a suggestion for the dev but not make it mandatory.

[mzfr]

Is there any addon that has already used SPDX-License-Identifier in their LICENSE.txt?

[MartijnKaijser]

There's currently none yet however it's pretty straightforward
Here's a list of identifiers
https://spdx.org/licenses/
For addons they should use something like
<license>GPL-2.0-or-later</license>
in the addon.xml and in the python file itself

Copyright (C) 2005-2018 Team Kodi
This file is part of Kodi - https://kodi.tv

SPDX-License-Identifier: GPL-2.0-or-later
See LICENSES/README.md for more information.

We should also encourage that this is added to every python file.
It should only be a warning/suggestion.

[mzfr]

@MartijnKaijser by GPL-2.0-or-later you mean GNU GENERAL PUBLIC LICENSE Version 2, June 199 right?
Also since License will stay same forever,Will hardcoding the License text be a problem?

[Rechi]

IMO license tag in addon.xml should be made mandatory before warning about python files which miss a SPDX-License-Identifier-

[razzeee]

I'm with rechi here, and we need to document this in the wiki first

[anxdpanic]

If add-ons are needed to test against, plugin.video.youtube, plugin.video.twitch and script.module.python.twitch are all using SPDX license identifiers.