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The "BROADCOM CONFIDENTIAL" header in a few of them certainly made me think otherwise...

codecs are mostly code in the firmware that uses vector instructions of the VPU to accelerate the video decoding

That means it should be possible for open-source firmware to add more, freely usable, codecs than in the proprietary firmware.

Yes if you can implement high performance video codecs using pretty much undocumented vector instructions of the VPU, you are welcome to do so.

Also, there are hardware blocks for JPEG and MPEG for best performance. See vcodec.h etc.

But the VPU 2D SIMD is good for non supported codecs.