Comment Re:Silver lining? (Score 2) 202
It looks to me like the EME would basically be a DLL on Windows, and I don't see why you can't rename the DLL to something else, and drop in a shim DLL that Firefox loads. The shim DLL then loads the real EME DLL, and just proxies all the API calls back and forth. Encrypted data goes into the shim, to the EME, decrypted video comes back. The shim would then be free to copy and redirect the decrypted video elsewhere. I doubt Firefox or the real EME would even know that it was happening.
If the EME is rendering the video itself, Firefox still has to pass it information about what surface to render to, and the shim DLL can just as easily fake that rendering surface and "render" to a file or something.
And it's not like Firefox can be forced to only load a certain signed EME DLL - you'd just recompile your own Firefox with a new key pair to loan your own signed shim.