Is that considered decryption? Wouldn't that both decrypt and decompress? What if someone wants the original compressed stream so the video doesn't need to be re-compressed?
That can't be done without hardware hacks, which can (often) be traced to isolated hardware which the manufacturers will then lock out or force a software upgrade for, making it impossible to use in the future. That's why most 4k pirate releases are re-encoded from HDMI, not lossless rips of the original stream as they are for 720p and 1080p.
