If you right-click on a font, choose the Properties, then view the Details tab, you can see the details about the font owner, creator and license.
Here is Microsoft's page about font redistribution:
https://learn.microsoft.com/en-us/typography/fonts/font-faq
Here are Microsoft's pages about Nirmala and Selawik:
https://learn.microsoft.com/en-us/typography/font-list/nirmala-ui
https://learn.microsoft.com/en-us/typography/font-list/selawik