Re: [PATCH RFC 1/4] LICENSES: Add SIL Open Font License 1.1

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On Thu, Nov 02, 2023 at 03:06:19PM +0100, Greg Kroah-Hartman wrote:
> On Thu, Nov 02, 2023 at 07:00:43PM +0700, Bagas Sanjaya wrote:
> > Add the license text along with appropriate tags for reference and
> > tooling. The text is taken from the text as distributed in Google
> > Fonts's zip files.
> > 
> > As the license itself may or may note be compatible with GPLv2,
> > let's take on the err side and require combining it with
> > GPL-compatible licenses when using the license.
> > 
> > Cc: linux-spdx@xxxxxxxxxxxxxxx
> > Cc: Richard Fontana <rfontana@xxxxxxxxxx>
> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Bagas Sanjaya <bagasdotme@xxxxxxxxx>
> > ---
> >  LICENSES/dual/OFL-1.1 | 107 ++++++++++++++++++++++++++++++++++++++++++
> 
> You add this license, but then never actually reference it in the later
> changes, so it's going to be very confusing as to why it is here.  Any
> way to add it to the font files themselves so our checker tools can
> handle this properly?

There is TTF name string ID called "License". For example, on IBM Plex Sans,
the string value is:

```
This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: http://scripts.sil.org/OFL
```

Checking that string requires scripting fontforge, and since the string value
may differ (but has the same license) across different fonts, scripting it
can be non-trivial.

> 
> And, it's not going to work as a dual-license, you can't just suddenly
> dual-license those font files, right?

I was thinking of putting OFL in LICENSES/exceptions instead due to this
nature.

> 
> >  1 file changed, 107 insertions(+)
> >  create mode 100644 LICENSES/dual/OFL-1.1
> > 
> > diff --git a/LICENSES/dual/OFL-1.1 b/LICENSES/dual/OFL-1.1
> > new file mode 100644
> > index 00000000000000..00b8db08bd0e54
> > --- /dev/null
> > +++ b/LICENSES/dual/OFL-1.1
> > @@ -0,0 +1,107 @@
> > +Valid-License-Identifier: OFL-1.1
> > +SPDX-URL: https://spdx.org/licenses/OFL-1.1
> > +Usage-Guide:
> > +  Do NOT use this license for code, but it's acceptable for fonts (where the
> > +  license is specifically written for them). It's best to use it together
> > +  with a GPL2 compatible license using "OR", as OFL-1.1 texts processed by
> > +  the kernel's build system might combine it with content taken from more
> > +  restrictive licenses.
> > +  To use the SIL Open Font License 1.1, put the following SPDX tag/value pair
> > +  into a comment according to the placement guidelines in the licensing rules
> > +  documentation:
> > +    SPDX-License-Identifier: OFL-1.1
> 
> Where did this Usage-Guide from?

Adapted from LICENSES/dual/CC-BY-4.0.

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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