Privacy and security company Proton has been extremely active this year.
This update includes what the company claims is the worlds first end-to-end encryptedsuggesting mode for Docs.
This gives teams a secure way to suggest edits in real-time without affecting the original document.

Proton AG
If you’re familiar with Google Docs and other online collaboration tools, it’s a lot like that.
Proton Drive now also supports password-protected, read-only public links with expiration dates.
This is designed to give users greater control over who can access shared documents.

Proton Drive users can now share sensitive info via read-only links that automatically expire.Proton AG
Docs has also received “intuitive” keyboard shortcuts for navigation and editing and new formatting options.