The DRM use case of TPM is mostly security theater, as after all that decoding work you still need to send the bits over an interface to speakers / a display, a

The DRM use case of TPM is mostly security theater, as after all that decoding work you still need to send the bits over an interface to speakers / a display, and even if that interface is secured there's no way to determine that there's not a studio quality microphone / video camera on the other side of an airgap.