US20050071663A1 - Separation of copy protection rules for digital rights management - Google Patents

Separation of copy protection rules for digital rights management Download PDF

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US20050071663A1
US20050071663A1 US10/672,929 US67292903A US2005071663A1 US 20050071663 A1 US20050071663 A1 US 20050071663A1 US 67292903 A US67292903 A US 67292903A US 2005071663 A1 US2005071663 A1 US 2005071663A1
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content
domain
rules
accordance
specified
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Alexander Medvinsky
Petr Peterka
Jiang Zhang
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Arris Technology Inc
Google Technology Holdings LLC
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General Instrument Corp
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Priority to US10/672,929 priority Critical patent/US20050071663A1/en
Assigned to GENERAL INSTRUMENT CORPORATION reassignment GENERAL INSTRUMENT CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MEDVINSKY, ALEXANDER, PETERKA, PETR, ZHANG, JIANG
Priority to US10/933,011 priority patent/US7551738B2/en
Priority to EP04784959A priority patent/EP1668461A2/de
Priority to PCT/US2004/031347 priority patent/WO2005031547A2/en
Priority to CA002539827A priority patent/CA2539827A1/en
Publication of US20050071663A1 publication Critical patent/US20050071663A1/en
Assigned to Google Technology Holdings LLC reassignment Google Technology Holdings LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MOTOROLA MOBILITY LLC
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/43615—Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/835—Generation of protective data, e.g. certificates
    • H04N21/8355—Generation of protective data, e.g. certificates involving usage data, e.g. number of copies or viewings allowed

Definitions

  • This invention relates to digital rights management (DRM), and more particularly to methods and systems for providing copy protection of digital content within an authorized domain.
  • DRM digital rights management
  • Such a domain can comprise, for example, a home network that is licensed to play content such as movies, games, music and the like on various different entertainment appliances coupled to the network.
  • CD music on compact discs
  • DVD digital versatile discs
  • SMPTE Society of Motion Picture and Television Engineers
  • Known copy protection standards include states such as “Copy One Generation”, “Copy No More”, and “Copy Free.” Such states make sense when content is communicated over an external unprotected interface or stored on media such as a CD or DVD.
  • states can make it very difficult for an authorized (e.g., licensed) user to use the content on different devices on that user's authorized domain (e.g. home network).
  • the present invention provides systems and methods for implementing digital rights management having the aforementioned and other advantages.
  • a method for managing rights to content within an authorized domain.
  • the method specifies if a copy of particular content is allowed to be provided on all devices or only on specific devices coupled to the domain via the interfaces.
  • Copy protection information with separately defined rules for outputs to external devices not protected by the common rights management system, is also specified.
  • Such a method may also specify whether particular content may be copied or moved to another domain protected by a rights management system.
  • a number of rendering devices permitted to render the content simultaneously may also be specified.
  • the ruleset can include, for example, rules defining capabilities of devices associated with the domain, rules defining persistent entitlements, and copy protection rules.
  • Rules defining capabilities of devices associated with the domain can include, for example, one or more of a device security level, a designation of whether a device supports secure time, a designation of codecs associated with a device, a designation of watermarks a device can check, and a designation of fingerprints a device can provide.
  • Rules defining persistent entitlements can include, for example rules for forwarding content on legacy analog, digital compressed and digital uncompressed interfaces, for peer-to-peer content sharing, content playback controls, limit on the number of simultaneous devices rendering the content, fingerprint algorithms and required device capabilities to render the content.
  • Copy protection rules can include, for example, legacy device rules for restricting copies over at least one of an analog, compressed digital or uncompressed digital interface. Copy protection rules can also include rules for non-persistent content to be displayed within the authorized domain.
  • the invention provides a system for distributing content to end users.
  • a network is used for the delivery of licensed content to a home network.
  • the home network can be an authorized domain where a plurality of domain interfaces are protected using a common rights management system.
  • Licensed content is associated with rights data specifying whether the content is allowed to be provided on all devices or only specific devices coupled to the domain via the interfaces.
  • Copy protection information is provided for outputs from the home network to external devices not protected by the common rights.
  • An additional network can be coupled to the home network for receiving the licensed content.
  • the additional network can also be an authorized domain, where all interfaces thereto are protected using the common rights management system.
  • FIG. 1 is an example screen shot showing a session rights element
  • FIG. 2 is an example screen shot showing a rule element
  • FIG. 3 is an example screen shot showing a purchase option element
  • FIG. 4 is an example screen shot showing a subscription element
  • FIG. 5 is an example screen shot showing a blackout element
  • FIG. 6 is an example screen shot showing a generic rating element
  • FIG. 7 is an example screen shot showing a selection element
  • FIG. 8 is an example screen shot showing a user authorization element
  • FIG. 9 is an example screen shot showing a persistent entitlements element
  • FIG. 10 is an example screen shot showing a rule set element
  • FIG. 11 is an example screen shot showing a redistribution element
  • FIG. 12 is an example screen shot showing a playback element
  • FIG. 13 is an example screen shot showing an option cost element
  • FIG. 14 is an example screen shot showing a copy protection rules element
  • FIG. 15 is a block diagram of an example network implementation of the invention.
  • IPRM IP Rights Management
  • Persistent access can be accommodated, for example, by storing the decrypted content on a hard drive provided, e.g., in a Personal Video Recorder (PVR) or Personal Computer (PC).
  • IPRM which is within the realm of Digital Rights Management (DRM), can be viewed as a generalization of conditional access technology.
  • the present disclosure describes Extensible Markup Language (XML) interfaces that are used by external systems in order to use services provided by the IPRM system.
  • XML documents need to be processed and understood by Caching Servers that deliver content to viewers (viewers comprise one category of IPRM clients) as well as by the IPRM clients that need to follow copy protection rules for the content that is being rendered and/or persistently stored.
  • Extensible Markup Language describes a class of data objects called XML documents and partially describes the behavior of computer programs which process them.
  • XML is an application profile or restricted form of SGML, the Standard Generalized Markup Language (ISO 8879). By construction, XML documents are conforming SGML documents.
  • XML documents are made up of storage units called entities, which contain either parsed or unparsed data. Parsed data is made up of characters, some of which form character data, and some of which form markup. Markup encodes a description of the document's storage layout and logical structure. XML provides a mechanism to impose constraints on the storage layout and logical structure.
  • a software module called an XML processor is used to read XML documents and provide access to their content and structure. It is assumed that an XML processor is doing its work on behalf of another module, called the application.
  • Content Provider An entity that creates, licenses, aggregates and/or distributes content to the Cache Servers.
  • a content provider does not typically consume content.
  • a content provider is responsible for specifying content access rules and possibly user selection if the user actually makes the purchase at the content provider's web portal. Otherwise, user selection is made by the Confirmation Server.
  • Cache Server An intermediate entity that stores and redistributes content to Consumers and optionally to other Cache Servers. Besides streaming content to viewers, it also enforces the content access rules against the user selection and user entitlements.
  • Confirmation Server An application facilitating the creation of a session rights object.
  • Consumer An entity such as an end-user that consumes content obtained from a Cache Server and optionally, if permitted by the copyright holder, redistributes content to other Consumers in the system.
  • the user is given a set of entitlements by the provisioning center that are used to determine the satisfaction of content access rules.
  • the user's selection is included in the Session Rights object.
  • Entitlements A set of authorization attributes that allow users to access content.
  • Provisioning Center An application that registers a new consumer (e.g. Viewer) with the network, provisions it with the Key Distribution Center (KDC) and creates a set of entitlements for the new user.
  • KDC Key Distribution Center
  • Session Rights Object A signed version of content access rules for a given piece of content and specific user's purchase option selection.
  • Viewer A consumer of video content.
  • a main purpose of the disclosed IPRM system is to provide digital rights management functions such as authentication, privacy, security, integrity and access control tools to any multimedia streaming network based on IP protocols.
  • the system supports point-to-point (VOD) and multicast delivery of content. Additional features relate to persistent (i.e., stored) content rights management, such as copy protection.
  • the system can be based purely on software protection, with a limited trust placed upon the clients.
  • a hardware security module is provided.
  • Such a hardware security module may be optional.
  • hardware security may be mandatory to obtain rights to high quality content from copyright owners requiring high security levels.
  • a Session Rights XML document can be generated by a content provider or any other entity (e.g. a Confirmation Server) that provides final interaction with the end-user.
  • the content of the Session Rights document may be encoded in a Session Rights Object.
  • a Rights element is the root element of the Session Rights document. It is a sequence of Content and Selection elements, which are required, and Provider and Rule elements, which are optional.
  • An authorization XML document can be maintained by the Provisioning Server and included in each ticket given to a Viewer by the KDC.
  • a Rights Manager module on the Caching Server can be provided to evaluate the rules and user selection against the authorization data in the ticket to allow or disallow access to the specified content.
  • Each XML document may consist of a root element and a set of nested elements.
  • FIG. 1 is a computer screen shot illustrating one possible implementation of a session rights element 10 .
  • Content element 12 which is part of the session rights element 10 , uniquely identifies the content associated with this set of session rights.
  • a “format” attribute can be provided as part of the content element to indicate the format in which the content identification is specified (e.g. URL, ISBN, etc.). URL, for example, can be the default.
  • An “id” attribute can be used to specify the unique content identifier.
  • a ‘protected’ attribute may be provided to indicate whether the associated content is encrypted (e.g., during the pre-encryption phase and/or when it is delivered to a consumer). This attribute can, for example, be set to ‘Y’ as a default option, indicating that the content is encrypted both during pre-encryption and when delivered. Otherwise, the associated content is unprotected.
  • a provider element 14 can optionally specify a ProviderID (“pid” attribute) and the provider name as a text string.
  • the rule element 16 specifies a set of rules for the content specified by the content element 12 .
  • An “extern” attribute can be provided for the rule element 16 to specify whether the rules are defined in this document (e.g., value “false”) or in an external document (e.g., value “true”). The default value can be, for example, “false.”
  • the rules do not change often and can be cached, for instance at a Caching Server, where the user can retrieve protected content.
  • the “extern” attribute may be set to “true” when the rules are being cached. Such an implementation will significantly reduce the size of each Session Rights Object (SRO).
  • SRO Session Rights Object
  • a selection element 18 specifies a purchase selection made by a user, on whose behalf this Session Rights document is presented.
  • An “optionID” attribute can be provided for the selection element 18 to identify a particular PurchaseOption defined within the Rule element that was selected by the user. Each option may be associated with different copy protection rules for persistent or non-persistent content.
  • An “extern” attribute may also be provided for the selection element 18 , to specify whether the selection is defined in this document (e.g., value “false”) or in an external document (e.g., value “true”). The default value may, for example, be “false.”
  • a “deviceBound” attribute may also be provided for the selection element 18 .
  • this attribute is set to ‘Y’, the content will not be shared outside the access device. If it is set to ‘N’, then the content will be shared across the user's authorized domain. If this attribute is not specified within the selection element 18 , the system can be implemented to check the same “deviceBound” attribute inside the persistent entitlements to find out whether or not to share particular content across the authorized domain.
  • the deviceBound attribute affects how blackout verification is performed. For example, if the content is not shared outside the access device, then the blackout check may only apply to the locations (listed inside Authorization Data) that have an “AccessPoint” attribute set to “Y.” Otherwise, all locations listed in the Authorization Data will need to be checked. The value of this attribute must be consistent with the persistent entitlements that are associated with the user selection.
  • the rule element 16 is illustrated in greater detail in FIG. 2 . This element specifies all access rules associated with the specified content. It is a choice of one or more of the available rules. If the rule element is not specified, it may be assumed that the content is:
  • a purchase element in the user Selection must be set to FREE.
  • the PurchaseOption element 20 defines copy protection rules or DRM rules for persistent data associated with a specific option for purchasing this content. This option is also associated with a price and a list of subscription services under which this option may be selected for free or at a decreased cost. Multiple PurchaseOption elements may be included to indicate different options for the user to purchase the content. Some of the options may restrict the purchase to only initial rendering of the content, while other options may allow the user to save a copy of the content with varying DRM rules.
  • the “optionID” of the Selection element 18 specifies the ID of the purchase option that was selected by the user.
  • an Origin Server generated a full set of Session Rights with both rules and user selection, there would only be a single PurchaseOption element included in the rules, which is the one selected by the user. This methodology is useful in conserving bandwidth. But if the Origin Server generates only the user selection while rules are cached on a Caching Server, the rules would typically include all PurchaseOption elements associated with this content.
  • the PurchaseOption element is described in greater detail below, in connection with FIG. 3 .
  • a Blackout element 22 provides a mechanism for geographically restricting access to given content. It provides the ability to define an area specified by a list of country codes or other types of location designators where the content is or is not allowed. The Blackout element is described in greater detail in connection with FIG. 5 . This rule will be evaluated against the list of LocationGroups in an Authorization Data document described hereinafter.
  • a GenericRating element 24 specifies the content rating level for a particular rating scale or standard (e.g., MPAA rating, TV rating, etc.). This element can be repeated multiple times in order to define the rating levels for multiple rating scales.
  • the GenericRating element is described in greater detail in connection with FIG. 6 .
  • the rule e.g., rule 16
  • the rule which includes the GenericRating element 24 will be evaluated against a GenericRating element in the Authorization Data document discussed below, representing a user rating ceiling. In one possible embodiment, the ceiling must be equal to or higher than the content rating.
  • This rule can be overridden by an Override element in the Selection element, as described in greater detail below in connection with FIG. 7 .
  • Fingerprint elements 26 shown in FIG. 2 specify a list of fingerprint algorithms that may be applied to content being sent to a client. In a preferred embodiment, if at least one fingerprint element is present, one of the fingerprint algorithms must be applied by the streaming server.
  • DeviceCapabilities element 28 specifies security requirements for a consumer device receiving the content. Some of these security requirements can apply to content rendering, while others may apply when a device makes a persistent copy of the content. For content rendering, one or more of the following attributes can be provided:
  • a PurchaseOption element is illustrated in greater detail in FIG. 3 .
  • One element of the PurchaseOption element is a GenericRights element 30 . This element has no type when directly present and indicates that the actual copy protection rules or rights associated with persistent content are specified in a different XML document.
  • the GenericRights element is also a substitution group in which the substitution elements can comprise:
  • a Cost element 32 associated with the PurchaseOption element 20 specifies the price of the content.
  • a “currency” attribute specifies the currency expressed as a 3-letter acronym defined by ISO 4217. US dollar can, for example, be the default value. If a different currency representation is needed in the future, the “format” attribute can be used to specify other formats. This element is not applicable when content is made available on subscription basis only.
  • Cost element 32 is not specified, the content cannot be purchased and may be available for subscription. If the Subscription element (discussed below) is not specified either, the content is assumed to be free of cost.
  • Additional nested elements can be provided to specify different ways to buy the content.
  • a OneTimePay element can be provided to specify the price for a pay-per-view purchase mechanism.
  • the “price” attribute can specify the cost for accessing this content.
  • a PBT element can be used to provide a mechanism to purchase content at time increments.
  • An “increment” attribute can be provided to specify the time interval (in minutes) that the “price” is associated with. For instance, if the “price” is 95 cents and the increment value is thirty, the user will be charged 95 cents for each thirty minutes that the content is viewed. This rule will be checked against the Payment element in the Selection element 18 ( FIGS. 1 and 7 ) and evaluated against the Pay element ( FIG. 8 ) in the Authorization Data document, which represents the user's ability to pay for content.
  • Table 1 defines the relationship between elements of the PurchaseOption (in columns) and user Selection (in rows).
  • the value YES specifies that the element of PurchaseOption in that column must be present and will be evaluated.
  • the value N/A specifies that the corresponding element may be present but will not be used for evaluating access rights.
  • the value NO means that the rule must not be present.
  • the value DENIED means that access will be denied.
  • the rightmost column shows the required value of the Pay element from the user authorization.
  • the selected PurchaseOption 20 must contain one or more SubscriptionGroups 34 . If there is at least one matching SubscriptionGroup without an IncrementalCost element 38 , then the Pay element ( FIG. 8 ) in the user selection will be ignored. Otherwise, the value of the Pay element must be INDIVIDUAL. If none of the Subscription or Cost rules is specified, the content can be accessed only if the user Selection is set to FREE.
  • SubscriptionGroup 34 includes the following two elements:
  • the aSubscription element specifies a list of services on which a piece of content is available for subscription, as illustrated in FIG. 4 . Because there are multiple methods for identifying service providers and services, aSubscription is an abstract placeholder for a specific subscription element.
  • the substitution elements for aSubscription are:
  • the Blackout element is illustrated in FIG. 5 . It comprises a sequence of locations where the content may or may not be viewed, depending on the value of a “restriction” attribute.
  • the “restriction” attribute specifies whether the content is blacked out (i.e. disallowed) inside the specified geographic area (e.g., value IN) or outside of the area (e.g., value OUT).
  • a “buyThru” attribute specifies whether the content can be purchased when the user would otherwise be blacked out. This is useful for content distributed on a subscription basis.
  • Each element of the Blackout sequence is a substitution group, needed to accommodate different types of location codes.
  • the element aLocation ( 50 ) is an abstract placeholder for a specific location element.
  • the substitution elements for aLocation are:
  • the GenericRating element 24 specifies a content rating, as illustrated in FIG. 6 .
  • GenericRating element is of type NMTOKEN and has the following possible values: LEVEL0, LEVEL1, LEVEL2, LEVEL3, LEVEL4, LEVEL5.
  • GenericRating may be used as a custom content rating scale where the meaning of each level is the same in both the Session Rights and in the Authorization Data XML documents. Because there are multiple rating scales, GenericRating is also a substitution group.
  • the substitution elements for GenericRating are:
  • MPAARating ( 62 )—a string with no white space that represents one of the MPAA rating levels.
  • TvRating 64 —a string with no white space that represents one of the North American TV rating levels.
  • the Selection element 18 illustrated in FIG. 7 specifies user selections related to the consumption or purchase of the selected content. It is a sequence of the following elements:
  • the Authorization element 80 of FIG. 8 is the root element of the User Authorization Data document. It can include a sequence of several optional elements. These are purchasing capability (Pay element), user location (Country element), user subscription (Subser and SubscrList elements), content rating ceiling (Rating element) and an element of type “any”.
  • the Authorization element has several attributes:
  • the Authorization element is also a sequence of the following elements:
  • the PersistentEntitlements element 90 is illustrated in an example embodiment in FIG. 9 .
  • Persistent entitlements define the content that a user is entitled to store, either on a hard drive, CD, DVD, or the like for later playback. Such content is referred to as “persistent” because it is stored for later use by the user.
  • This PersistentEntitlements element 90 is the root element of the IPRM Persistent Rights schema. It can either be utilized as a separate XML document that is included inside the SRO along with the Session Rights document, or it can be included directly inside the Session Rights as part of one of the PurchaseOption elements 20 discussed in connection with FIG. 3 .
  • PersistentEntitlements contains the following attributes:
  • PersistentEntitlements 90 is also a sequence of the following elements, shown in FIG. 9 :
  • the RuleSet element 92 described in FIG. 10 sets forth an example of all the rules associated with the specified persistently stored content. (The identity of the content, e.g., a URL, would normally be included in the persistent content entitlements, even though it is not shown in FIG. 10 ).
  • a RuleSet element contains a deviceBound attribute, which is a Boolean flag that when set, e.g., to ‘Y’ means that once a Viewer saves a copy of this content, no further copies of the content may be made, even within the same authorized domain (user's personal network) protected by IPRM security.
  • RuleSet is a sequence with each element (for the exemplary embodiment) as described below.
  • the AnalogOutput element 100 restricts copies over an analog interface. It can also define analog proprietary system (APS) parameters, where APS is a mechanism to prevent analog copies of a video signal and would normally be used when the ‘copyRestriction’ attribute defined below is set, e.g., to NOCOPY (i.e., analog copies are not allowed).
  • APS analog proprietary system
  • An example of an APS is the well known Macrovision system.
  • NOCOPY an audio-only (e.g., music) content, analog output has to be completely disabled.
  • the AnalogOutput element 100 consists of the following attributes which apply specifically to analog output:
  • the DigitalCompressedOutput element 101 restricts copies over an external digital compressed interface that is not protected with the IPRM system.
  • An example of such an interface would be IEEE-1394 (Firewire bus). However, if there is an IP stack running on top of IEEE-1394 and IPRM is used to protect content over this interface, this element would be ignored.
  • DigitalCompressedOutput consists of the following attributes:
  • the DigitalUncompressedOutput element 102 restricts copies of the content that is received over an external digital uncompressed interface (e.g., Digital Video Interface “DVI”) that is not protected with IPRM.
  • DVI Digital Video Interface
  • the Redistribution element 103 defines rules for retransmission of the content beyond the current authorized domain. Note that this element does not apply to super distribution, where a copy of the content is sent to another consumer (in a new authorized domain) without any rights to use the content. This element is used in the cases when an initial set of persistent content entitlements already allows the content to be lawfully shared between multiple authorized domains without an additional cost.
  • the Redistribution element has the following attribute:
  • the Redistribution element 103 illustrated in greater detail in FIG. 11 , includes a sequence of zero or more Destination elements 110 , where each destination element allows the content to be copied or moved to that specific destination that is outside of the current authorized domain. Whether or not it has to be a move rather than a copy is determined by the ‘move’ attribute of the Redistribution element.
  • a Destination element contains the following attributes:
  • the Redistribution element can also optionally include a GeographicalRestriction element 112 that might prevent movement or copying of content into authorized domains listed in Destination elements, if they are located in blacked out geographical regions.
  • the Playback element 104 places restrictions on playback of stored content. It defines conditions which determine when stored content becomes expired and may no longer be used.
  • the Playback element is illustrated in greater detail in FIG. 12 , and has the following optional attributes:
  • a Playback element is a sequence of one or more of the following elements:
  • the MulticastLimit element 105 limits the number of devices that the content can be simultaneously streamed to from a residential home gateway. This does not have to be an IP multicast. If the same content is being streamed to several clients simultaneously over multiple point-to-point connections, that would also qualify as a multicast in this case. A value of, e.g., zero means that the number of such simultaneous devices is unrestricted. Each single multicast of the content is counted as a single playback.
  • the Fingerprint element 106 identifies a fingerprint algorithm that is to be inserted into the content as it is being decompressed and delivered over an external analog or digital uncompressed interface.
  • Fingerprint elements may be included in order to provide a choice to the rendering device. This element has the following attribute:
  • the DeviceCapabilities element 107 places some requirements on a device that is allowed to render or store a copy of the content. It has the following attributes:
  • the OptionCost element 96 is a sub-element of a RenewalOption 94 as shown in FIG. 9 , and identifies the cost of using this option and this set of content usage rules to either renew a license or to buy a super distributed copy of the content.
  • the attributes of OptionCost are:
  • OptionCost element 96 illustrated in greater detail in FIG. 13 , is a sequence of one or more of the following:
  • the CopyProtectionRules element 140 is the root element of the IPRM Copy Protection Rules schema, and is illustrated in FIG. 14 . This element contains copy protection rules associated with forwarding content over output ports and defines rules which are a subset of the rules in IPRMPersistentEntitlements.
  • CopyProtectionRules is a sequence of the following elements:
  • FIG. 15 is a block diagram illustrating an example network environment in which the invention can be used.
  • a content provider 150 provides digital content via a communications network 151 such as the Internet.
  • the content may be provided, for example, as streaming media.
  • a home gateway 152 can decrypt the content (if decryption is authorized) and apply the IPRM rules to the content. If authorized for copying, the content can be copied onto a DVD writer 155 , or the like.
  • other copying means may be provided, such as a CD writer, video tape recorder, etc.
  • Licensed content may also be stored locally, e.g., on a hard disk drive 156 . Other types of storage media currently known or developed in the future may additionally or alternatively be provided for storing licensed content to be played at a later time.
  • Various video, audio and/or multimedia appliances may be coupled to the home gateway for reproduction and/or storage of licensed content.
  • Such devices referred to as device N and device N+1 are illustrated in FIG. 15 as devices 153 and 154 .
  • These may be analog or digital devices which are permitted or denied access to particular content based on the IPRM rules applied by the home gateway 152 , e.g., in accordance with XML documents as described above. Any number of such devices within the hardware and/or software capabilities of the particular home gateway 152 may be provided.
  • a home network 157 is also coupled to the home gateway 152 to distribute content to appliances (e.g., PCs, televisions, PVRs, CD/DVD players, etc.) coupled to the home network.
  • the home network 157 may be any type of available network, including wired and wireless (e.g., any of the IEEE 802.11 Wi-Fi standards, Bluetooth, etc.).
  • the home network 157 may also be coupled, via a suitable gateway 158 as well known in the art, to other authorized networks 159 .
  • Such a network 159 may comprise, for example, another home network to which the subscriber at home network 157 is authorized to forward licensed content. This can be useful, for example, where the subscriber at home network 157 has a second (e.g., vacation) home where it is desired to view content.
  • the present invention provides methods for IP rights management within an authorized domain.
  • the methods provide flexibility in that rules for separate systems do not have to be tied together. Instead, a universal set of rules is provided to enable rights management in an authorized network that may include many different products, including both analog and digital video, audio, and multimedia appliances. Moreover, rules are provided for both streaming content and locally stored content.

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EP1668461A2 (de) 2006-06-14
US7551738B2 (en) 2009-06-23

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