1. A method for defining rights applicable to a digital object, the method comprising: receiving a set of initial rights including at least first and second initial rights and a set of modifying rights for the digital object, wherein the first and second initial rights match a corresponding modifying right by being associated with a corresponding common action, each of the initial rights having an associated initial condition and each of the modifying rights having an associated modifying condition; and defining, using one or more processors, a set of new conditions for the initial rights by combining the modifying condition and a matching initial condition based on a combining rule wherein the defining is performed by a digital rights management system.