29. The at least one non-transitory computer-readable medium of claim 28 , wherein the legality expression language further includes an intent element specifying an intention that a principal wants to perform an act.
28. At least one non-transitory computer-readable medium having a computer readable legality expression stored thereon for use in a system for processing said legality expression, said legality expression comprising: at least one digital data element from a legality expression language, including at least one of: a duty element specifying an obligation that a principal must perform an act, a ban element specifying a prohibition that a principal must not perform an act, and a claim element specifying an assertion that a principal does perform an act, wherein at least one attribute corresponds to the at least one digital data element, and the at least one element and the at least one attribute form said legality expression, said legality expression being recorded thereon in a tangible form that can be interpreted by the system for processing legality expressions to thereby permit the system to enforce the legality expression.