Introduction to Digital Rights Management - DRM

DRM Key Management

Key management is the creation, assignment, storage, delivery/transfer and revocation of unique information (keys) by recipients or holders of information (data or media) to allow the information to be converted (modified) into a usable form. Keys may be stored and controlled in removable security devices (e.g. smart cards) or they may be assigned, stored and updated within a device (e.g. virtual smart cards).

Key assignment is the process of creating and storing a key so a user or device is able to decode content. Key assignment may be performed by sending a command from a system to a device or it may be performed by providing information to a user for direct entry into a device or system that creates a new unique key.

Key revocation is the process of deleting or modifying a key so a user or device is no longer able to decode content. Key revocation may be performed by sending a command from a system to a device.

DRM systems can have multiple types of keys with different levels (hierarchy) of security. A key hierarchy is a structure of key levels that assigns higher priority or security level to keys at higher levels. Upper layer keys may be used to encrypt lower level keys for distribution. Examples of keys with different levels include session keys that do not change during a communication session and content keys that repeatedly change every few seconds to ensure that media will stop playing if the authorization to view has ended.

Key exchange protocols are used to coordinate and securely transfer keys in a communication system. Key protocols may be proprietary or they may be standardized. An example of an industry standard key exchange protocol is Internet key exchange (IKE). IKE is defined in request for comments 2409 (RFC 2409).

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Digital Rights Management - DRM Books

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Introduction to Digital Rights Management - DRM

Digital rights management systems identify, track, authorize and restrict access to digital media. You will learn how DRM systems help to protect and enforce copyrights, patents, trademarks, and other forms of intellectual property. Discover how to uniquely identify digital media and how to monitor and track the usage of digital media.

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