from the team:
Hi everyone,
At Proton, privacy and transparency have always been our top priorities. Today, we’re happy to announce that all Proton Drive apps are now fully open source.
Proton products are used by millions of users across the globe, our users deserve a promise of privacy that they can trust and verify for themselves
Why Open Source?
Transparency
You can now independently verify how Proton Drive safeguards your data.
Security
With the global community reviewing and improving our code, we benefit from innovative new security practices as soon as they’re available.
Trust
Don’t just take our word for it—you can inspect our apps yourself and see that your privacy is built-in by design.
We invite developers, security experts, and privacy advocates to explore, review, and contribute to our code on GitHub:
https://github.com/ProtonDriveApps
Thank you for your continued support and trust in Proton.
Start backing up your files, folders, and photos today with free end-to-end encrypted storage.
Find out more here: https://proton.me/blog/drive-open-source
But are they libre software?
GPL3 fwiw