System and method for protecting digital contents with digital rights management (DRM)

摘要

An approach for protecting digital contents includes a content delivery phase wherein a client stores digital contents or retrieves them in streaming, transmits to a user device the digital content in a protected format along with an enabling code for enabling the user device to access or read the protected digital content. The approach includes a key generation phase in a DRM (Digital Right Management) server which derives at least one key for encrypting the digital contents. A key transmission phase involves the derived key being transmitted from the DRM server to the client. For decrypting the digital content, the user device requests the key from the DRM server, with the request including a key identification defined by the enabling code transmitted by the client to the user device which is used by the DRM server to derive the key for the user device.

主权项

1. A method for protecting digital contents comprising:
a content delivery phase wherein a content server stores digital content or receives streaming digital content, and transmits to a user device the digital content in a protected format along with a key identification; a key generation phase in a Digital Rights Management (DRM) server which derives at least one key without storing the key; a key transmission phase wherein the derived key is transmitted from the DRM server to the content server for protecting the digital content; wherein, for unlocking the digital content, the user device requests the derived key from the DRM server, the request including the key identification transmitted by the content server to the user device which is used by the DRM server to derive the key for the user device; wherein the key generation phase is requested from a DRM batch protector module of the content server to the DRM server before encrypting the digital contents, the encryption of the digital contents being executed offline in the DRM batch protector module after receipt of the derived key from the DRM server as an encryption key; and wherein the DRM batch protector module reads the digital contents from a local directory or from a Uniform Resource Locator (URL) and retrieves the encryption key from a key file provided to the DRM batch protector module by the DRM server with password protection.