Storing, by an owner of a digital media product, the product in a distributed media library, the library including information describing the modifiable part of the digital media product and a digital grant of rights to modify and distribute the product; producing, from users' digital expressions of preferences, information describing a user community preference for replacing the modifiable part of the digital media product with a replacement part; retrieving the digital media product and the digital grant of rights to modify and distribute the digital media product; receiving at least one replacement part, a digital grant of rights to use the replacement part to modify the digital media product, and a digital grant of rights to distribute the replacement part with the digital media product; and replacing, in accordance with the information describing the user community preference and the digital grants of rights, the modifiable part with the replacement part.