HYBRID DIGITAL RIGHTS MANAGEMENT SYSTEM AND RELATED DOCUMENT PROTECTION METHOD

摘要

A hybrid digital rights management (DRM) system includes a hybrid digital rights management server (RMS server) connected to first and second RMS servers and a client computer. The hybrid RMS server stores a policy mapping table that maps its DRM policies to remote DRM policies on the first or second RMS servers, and can also create policies that satisfy the schema requirements of the first or second RMS server using policies stored in the hybrid RMS server. When the hybrid RMS server receives a document protection request from the client computer, it extracts the filename extension for the document to be protected, and uses the filename extension to select one of the first and second RMS servers as a target RMS server. The document is protected by the target RMS server, and also added to a protected document database on the hybrid RMS server.

主权项

1. A digital rights management method implemented in a hybrid digital rights management server (hybrid RMS server), the hybrid RMS server being connected to a first digital rights management server (first RMS server), a second digital rights management server (second RMS server), and a client computer, the method comprising:
(a) receiving a document protection request from the client computer, the document protection request including a requested document, a filename of the requested document, and a policy ID of a requested DRM policy; (b) retrieving a filename extension from the filename, and based on the filename extension, identifying at least one of the first and second RMS servers as a target RMS server; (c) obtaining full policy information about the requested DRM policy including which users have what access rights to a document under the DRM policy; (d) determining whether the target RMS has a remote DRM policy that corresponds to the requested DRM policy; (e) if the target RMS has a remote DRM policy that corresponds to the requested DRM policy, obtaining a remote policy ID for the remote DRM policy of the target RMS server, and if the target RMS has no remote DRM policy that corresponds to the requested DRM policy, generating a remote DRM policy for the target RMS server from the full policy information of the requested DRM policy using a policy schema of the target RMS server; (f) accessing the target RMS server and transmitting a remote document protection request including the requested document and either the obtained remote policy ID or the generated remote DRM policy; and (g) storing the requested document ID in association with the full information of the requested DRM policy.