[PATCH 2/2] LICENSE: add SPDX identifiers

[Paul Spooren]

Hi Adrian,

On 28.07.20 23:32, Paul Spooren wrote:
> SPDX license header follow a machine readable and versioned identifier
> format for licenses. The adoption to such system would simplify
> scanning of licenses within OpenWrt.
>
> Adopted from the Linux Kernel[0] store store SPDX identifiers at the
> top of the LICENSE file.
>
> Both the `GPL-2.0` and `GPL-2.0+` identifiers are deprecated[1] and are
> in contrast to the Linux Kernel not added. When adding such headers it
> should be the latest SPDX version.
>
> [0]: https://github.com/torvalds/linux/commit/255247c2770ada6edace04173b35307869b47d99
> [1]: https://spdx.org/licenses/
>
> Signed-off-by: Paul Spooren <mail at aparcar.org>
> ---
>   LICENSE | 13 +++++++++++++
>   1 file changed, 13 insertions(+)
>
> diff --git a/LICENSE b/LICENSE
> index d159169d10..687bdddb11 100644
> --- a/LICENSE
> +++ b/LICENSE
> @@ -1,3 +1,16 @@
> +Valid-License-Identifier: GPL-2.0-only
> +Valid-License-Identifier: GPL-2.0-or-later
> +SPDX-URL: https://spdx.org/licenses/GPL-2.0.html
> +Usage-Guide:
> +  To use this license in source code, put one of the following SPDX
> +  tag/value pairs into a comment according to the placement
> +  guidelines in the licensing rules documentation.
> +  For 'GNU General Public License (GPL) version 2 only' use:
> +    SPDX-License-Identifier: GPL-2.0-only
> +  For 'GNU General Public License (GPL) version 2 or any later version' use:
> +    SPDX-License-Identifier: GPL-2.0-or-later
> +License-Text:
> +
>                       GNU GENERAL PUBLIC LICENSE
>                          Version 2, June 1991
>   

Thanks for merging the first patch, do you have any doubts regarding the 
SPDX tags?

We could use a scripts that automatically checks if added code uses the 
correct SPDX license.