Regarding HDCP, while 1.x is currently wide open, I'm not aware of any "crack" of HDCP 2.2, the currently required version for 4k content. There might have been keys leaked, but key extraction is only getting harder, with devices embedding keys deeper into the chipsets, with software/hardware video paths inaccessible from traditional OSes, etc.

Also, I would be surprised their isn't a watermark in there that will point to the cinema who leaked the version.