It is a public GPG key (not a Microsoft Publisher file) and while I don’t know, I assume it is used to verify that future updates are from Nvidia and not a malicious third party. It is really common (if not required) to install and trust a new gpg key when adding a new repository in Linux package managers, and done for safety reasons without privacy implications, and I am guessing this is what Nvidia is doing here.

Where do you see any indication that it is used for identification of you/your machine?

I quite enjoy challenging my musical knowledge with https://bandle.app/

http://bettermotherfuckingwebsite.com/

My own use for OneNote was mainly drawing/hand written notes using a drawing tablet. For that use case, I have replaced it with Xournal++

For other notes written with the keyboard, I use simple local markdown files.

All my notes are synced between computers with Syncthing

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