Abstract: A system for distributing digital content over a computer network (e.g., the Internet) uses certificates to establish a trust relationship between a content provider and a display device. The certificates identify the display device and the content provider as well as unique characteristics of the distribution. For example, the content provider may be a book publisher and the display device may be a printer/binder.

Abstract: The invention relates to a multi layered conditional access method for processing a protected digital content between a content protector, an intermediate receiver, and final destination means. The method comprises: a) the encryption by the content protector of a key or keys for accessing protected digital content, b) the transmission from the content protector to the intermediate receiver of the encrypted key or keys, c) the decryption and re-encryption of the key or keys by the intermediate receiver, d) the transmission of the re-encrypted key or keys to a final destination device, and e) the decryption of the re-encrypted key or keys by the final destination device. The invention is further related to a storage medium having recorded thereon encrypted program data in a data format able to perform the process of the invention, and to an insertable electronic smart card for use in a multi layered conditional access system.

Abstract: A system for distributing digital content over a computer network (e.g., the Internet) uses certificates to establish a trust relationship between a content provider and a display device. The certificates identify the display device and the content provider as well as unique characteristics of the distribution. For example, the content provider may be a book publisher and the display device may be a printer/binder.

Abstract: There is provided a conditional access system for the distribution and management of digital rights and keys in business-to-business applications of a plurality of actors including rights owners and rights consumers. The logical path between the rights owner and the rights consumer is decomposed into a succession of point-to-point communications between actors or groups of actors and by sharing information that allows identifying actors or groups of actors and establishing secure communications between these actors or groups of actors. Keys communication channels and digital rights communication channels are matched with a network of business relations defining a network of trust between the different actors. The conditional access system of the invention for the distribution and management of digital rights and keys is adapted to be used in a digital cinema network comprising keys communication channels and digital rights communication channels.

Abstract: A mobile code linked to a certificate including at least a resource requirements list (RRL) including those resources needed by the mobile code to be properly executable plus those resources that are known a priori to be accessed when executing the mobile code. The unique certificate contains additionally an issuer of the certificate information identifying the entity issuing the certificate, a subject information identifying the mobile code to which the certificate is referred, and a validity period information stating the period of time within which the certificate is valid. When downloading or uploading a mobile code the RRL is transferred to the user informing the user of the resource requirements of the mobile code. An execution environment is provided in an execution peer of the user, the execution environment defining at least the resource access policy that will be applied to the mobile code on execution.