The EME standard is explicitly designed to support hardware encryption systems that provide end-to-end encryption - think a proprietary decryption black box in your devices that takes an encrypted, compressed video screen and overlays it directly onto the screen output without it ever touching RAM anywhere where software can access it. Good luck breaking that, short of inconvenient hacks involving HDCP decryption and recompression (and those may not be long for this world either - newer video outputs are AES-encrypted).