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Yep, but without the proprietary part. We have released reference designs under Creative Commons: https://github.com/FrameworkComputer/ExpansionCards

I think the recessed USB-C dongles are a fantastic idea. I'd love for this to become a standard feature on laptops.

Can miscellaneous third parties can create and sell their own Framework-compatible expansion modules?

Can other manufacturers make laptops with Framework-compatible expansion slots?

A USB-C slot with publicly-available and open-source CAD and specs on GitHub (https://github.com/FrameworkComputer/ExpansionCards) is basically the least proprietary format ever created.

Is USB-C proprietary now?

I think it's just normal USB-C dongles but installed in the chassis, isn't it?

Can something be open source and proprietary?

Some people use the word "proprietary" to mean "different" or "nonstandard" rather than "is someone else's property and costs money to use". It's a weird bit of semantic drift.

In the software world, this is usually described as "source-available", where the source is, well, available, but the license has restrictions such as not allowing commercial use.

Yes.

Example: https://github.com/commaai/openpilot