Abstract: A reference-level gear helix artifact for transferring gear helix value. The invention provides a reference-level gear helix artifact with a global symmetrical structure that can be easily obtained by generating method. The centroid point of the artifact passes through the geometric center of the artifact mandrel. The cylinder of the reference-level gear helix artifact is provided with the straight tooth groove, the left-hand tooth groove and the right-hand tooth groove, axial reference torus and radial reference cylinder, fine tooth threads and center holes. Among them, the straight tooth groove includes a pair of involute cylindrical surfaces with opposite 0° helix angle, the left-handed tooth groove includes a involute helicoidal surface with 15° and a involute helicoidal surface with 30°, and the right-hand tooth groove includes a involute helicoidal surface with 15° and a involute helicoidal surface with 30°.

Abstract: A server, comprising a communication unit for receiving a user identifier and a unique identifier of digital content to be transferred from a first terminal, and feeding back intermediate information to the first terminal, and for receiving intermediate information and second terminal device information from a second terminal, and sending a license to the second terminal; a rights acquisition unit for acquiring rights information of the digital content to be transferred; a generation unit for generating the intermediate information; an authentication unit for authenticating the intermediate information from the second terminal; a license generation unit for generating a license. Information may be generated according to user identifier of the transferor and rights information of the digital content. The acceptor may gain use rights of the digital content based on received intermediate information, so that transfer flow of the digital content is optimized, leading to more convenient user operations.

Abstract: A method for updating an authorization of electronic information includes receiving, by an authorization updating server, first information from a user equipment requesting for updating authorization items, wherein the first information includes first identification information and a first list of authorization items requested to be updated, determining a second list of authorization items stored in the authorization updating server that correspond to the first identification information, comparing the first list of authorization items and the second list of authorization items and determining a third list including authorization items that are listed in both the first list and the second list of authorization items, and transmitting the third list of authorization items to the user equipment.