Well, historically all those mechanisms have been problems for the open web. To me, the question is why you couldn&#x27;t achieve the same thing without making the CDM a blackbox, e.g. just by issuing license keys and standardizing the encryption&#x2F;decryption of content. It seems like the <i>only</i> benefit to making CDMs blackboxes is that it gives publishers more control over the user&#x27;s environment.