Further explanation of PlayReady DRM support

I'd like an answer to this question as well. I'm looking at making a simple channel to connect with a service that uses PlayReady and issues a protection key separate from the ISM Manifest. The manifest does have a protection header with a LA_URL, but it can't obtain a license without presumably supplying the out-of-band protection key as part of the license request. I guess this qualifies as "indirect licensing" as mentioned in the docs? If so, is there a plan to support this type of license acquisition in the future?