1. A method for making multi-system constraint of a specific permission in a digital right, comprising: obtaining a rights object related to a content object by an executing device, wherein descriptions of a specific permission of the rights object include system constraint descriptions of a plurality of systems of the same type; obtaining corresponding system information in the executing device by the executing device according to said system constraint descriptions; comparing the system information in the executing device with the system information in said system constraint descriptions by the executing device; judging whether there is a permitted system in said system constraint descriptions in the executing device; and determining to permit executing said specific permission for the content object if both are the same, otherwise, determining not to permit executing said specific permission for the content object.