Replace SimSun Font

[faxe1008]

Introduce the problem

Brought up in our downstream fork of the module:
zephyrproject-rtos/zephyr#87363

There is no license for SimSun to be found.

Proposal

Replace the font with one that has a known permissive license, e.g.
https://github.com/adobe-fonts/source-han-sans/tree/master

[faxe1008]

Generally speaking there are loads of fonts in the repository for which licensing is unclear:

./scripts/built_in_font/unscii-8.ttf
./src/libs/freetype/arial.ttf
./examples/libs/freetype/Lato-Regular.ttf
./examples/libs/freetype/NotoColorEmoji-32.subset.ttf
./examples/libs/tiny_ttf/Ubuntu-Medium.ttf
./tests/src/test_files/fonts/noto/NotoSansSC-Regular.ttf
./demos/smartwatch/assets/SpaceGrotesk-SemiBold.ttf
./demos/smartwatch/assets/RobotoSerif-Light.ttf
./demos/smartwatch/assets/RobotoSerif-Medium.ttf
./demos/smartwatch/assets/RobotoSerif-ExtraBold.ttf
./demos/smartwatch/assets/Inter_28pt-ExtraBold.ttf
./demos/smartwatch/assets/SpaceGrotesk-Medium.ttf
./demos/smartwatch/assets/SpaceGrotesk-Regular.ttf
./demos/smartwatch/assets/RobotoSerif-Black.ttf
./demos/smartwatch/assets/RobotoSerif-ExtraLight.ttf
./demos/smartwatch/assets/Inter_28pt-Thin.ttf
./demos/smartwatch/assets/RobotoSerif-Bold.ttf
./demos/smartwatch/assets/SpaceGrotesk-Bold.ttf
./demos/smartwatch/assets/Inter_28pt-Light.ttf
./demos/smartwatch/assets/RobotoSerif-SemiBold.ttf
./demos/smartwatch/assets/Inter_28pt-Regular.ttf
./demos/smartwatch/assets/RobotoSerif-Regular.ttf
./demos/smartwatch/assets/SpaceGrotesk-Light.ttf
./demos/smartwatch/assets/Inter_28pt-Bold.ttf
./demos/ebike/assets/Inter-SemiBold.ttf
./demos/ebike/assets/TrumpGothicPro-Bold.ttf
./demos/ebike/assets/TrumpGothicPro.ttf
./demos/multilang/assets/fonts/NotoNaskhArabic-SemiBold.ttf
./demos/multilang/assets/fonts/NotoSerifDevanagari-SemiBold.ttf
./demos/multilang/assets/fonts/Montserrat-Bold.ttf
./demos/multilang/assets/fonts/NotoSerifHebrew-SemiBold.ttf
./demos/multilang/assets/fonts/NotoSansSC-Medium.otf

[faxe1008]

I went over the fonts a did a check (I am not a lawyer tho, be aware):

Should be OK (UBUNTU FONT LICENCE Version 1.0):

./examples/libs/tiny_ttf/Ubuntu-Medium.ttf

Rests with Microsoft seems to be forbidden to redistribute (https://learn.microsoft.com/en-us/typography/fonts/font-faq):

./src/libs/freetype/arial.ttf

Payed license:

./demos/ebike/assets/TrumpGothicPro-Bold.ttf
./demos/ebike/assets/TrumpGothicPro.ttf

OK - but no liecense file intree (SIL Open Font):

./demos/smartwatch/assets/RobotoSerif-Light.ttf
./demos/smartwatch/assets/RobotoSerif-Medium.ttf
./demos/smartwatch/assets/RobotoSerif-Black.ttf
./demos/smartwatch/assets/RobotoSerif-ExtraLight.ttf
./demos/smartwatch/assets/RobotoSerif-ExtraBold.ttf
./demos/smartwatch/assets/RobotoSerif-Regular.ttf
./demos/smartwatch/assets/RobotoSerif-Bold.ttf
./demos/smartwatch/assets/RobotoSerif-SemiBold.ttf
./examples/libs/freetype/Lato-Regular.ttf
./examples/libs/freetype/NotoColorEmoji-32.subset.ttf
./demos/multilang/assets/fonts/NotoSansSC-Medium.otf
./demos/multilang/assets/fonts/NotoSerifHebrew-SemiBold.ttf
./demos/multilang/assets/fonts/NotoSerifDevanagari-SemiBold.ttf
./demos/multilang/assets/fonts/NotoNaskhArabic-SemiBold.ttf
./tests/src/test_files/fonts/noto/NotoSansSC-Regular.ttf
./demos/smartwatch/assets/SpaceGrotesk-Light.ttf
./demos/smartwatch/assets/SpaceGrotesk-Regular.ttf
./demos/smartwatch/assets/SpaceGrotesk-Bold.ttf
./demos/smartwatch/assets/SpaceGrotesk-Medium.ttf
./demos/smartwatch/assets/SpaceGrotesk-SemiBold.ttf
./demos/smartwatch/assets/Inter_28pt-ExtraBold.ttf
./demos/smartwatch/assets/Inter_28pt-Thin.ttf
./demos/smartwatch/assets/Inter_28pt-Light.ttf
./demos/smartwatch/assets/Inter_28pt-Regular.ttf
./demos/smartwatch/assets/Inter_28pt-Bold.ttf
./demos/ebike/assets/Inter-SemiBold.ttf

To me it seems like the shipment of arial and TrumpGothicPro is potentially problematic.

[kisvegabor]

I'm checking it with out designer.

In the meantime I moved the new demos to a new repo: #8022