Tuesdays the Patent Office issues new patents. Both of today's Spotlight Patents address aspects of digital rights management. Assigned to Microsoft, the first of today's patents concerns techniques for managing domains for digital media. Assigned to Postech Academy--Industry Foundation (KR), the second patent concerns techniques for providing DRM interoperability.
8,387,154, "Domain management for digital media," assigned to Microsoft.
In accordance with the domain management for digital media, a device obtains multiple pieces of protected content from multiple content providers, where two or more of the content providers employ different digital rights management systems. The device also accesses a license server to obtain, for each piece of protected content, a content license that is bound to a domain. The content license permits the device to play back a piece of protected content.
8,386,799, "Methods and apparatuses for providing DRM interoperability," assigned to Postech Academy--Industry Foundation (KR).
Methods and apparatuses for providing DRM interoperability are provided. Proxy re-encryption technique using bilinear map is used, and the same content can be used in different devices. According to the method of providing DRM interoperability includes in proxy agent with respect to digital rights management (DRM) service providers and device which supports predetermined DRM, first DRM service provider, second DRM service provider, the proxy agent, and the device identify each other, and proxy re-encrypt an interoperable content (IC) and provide the IC to the device. The IC is second-level encrypted by using a key of the first DRM service provider, and the proxy re-encryption is performed by using a proxy key generated from proxy key information provided from the first DRM service provider and the second DRM service provider. Therefore, a problem in which interoperability cannot be guaranteed since a DRM technique depends on a service provider is resolved.