Doubt you'd even have to do that much, unless they build the decryption into the CPUs or something.
DRM of any kind suffers from the Bob = Eve problem - it is cryptographically unsound. I'm sure once the source is available there will be software readily available to extract the device key and then you can just decrypt the apks either on the device or elsewhere.
To really get DRM to work on Android would require locking it WAY down - so much that I doubt that many LWN readers would be interested in it any longer. This seems to be more of a token gesture. I'm sure it will be unbreakable for a week or two...