I'd suggest we create some new HTTP response headers. I'm not wedded to these names, but I think the role of each is important.
Resource-Owner: This could be defined as an email address. This allows a way of identifying who should be paid that A) can be tied back to domain registration, and B) allows for specifying both the organization as well as the author (allowing a site to divvy up revenue by contributors for example).
Resource-Price: Formatted as a number followed by an ISO 4217 currency code