US20060047952A1 - Method, system, device , signal and computer program product for metadata protection in tv-anytime - Google Patents

Method, system, device , signal and computer program product for metadata protection in tv-anytime Download PDF

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US20060047952A1
US20060047952A1 US10/531,616 US53161605A US2006047952A1 US 20060047952 A1 US20060047952 A1 US 20060047952A1 US 53161605 A US53161605 A US 53161605A US 2006047952 A1 US2006047952 A1 US 2006047952A1
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Prior art keywords
data
signature
fragments
data fragments
fragment
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Sebastiaan Antonius Fransiscus Van Den Heuvel
Alexis Ashley
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Assigned to KONINKLIJKE PHILIPS ELECTRONICS, N.V. reassignment KONINKLIJKE PHILIPS ELECTRONICS, N.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ASHLEY, ALEXIS STEPHEN RICHARD, VAN DEN HEUVEL, SEBASTIAAN ANTONIUS FRANSISCUS ARNOLDUS
Publication of US20060047952A1 publication Critical patent/US20060047952A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures
    • 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
    • H04N21/8352—Generation of protective data, e.g. certificates involving content or source identification data, e.g. Unique Material Identifier [UMID]
    • 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
    • H04N21/84—Generation or processing of descriptive data, e.g. content descriptors
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00855—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a step of exchanging information with a remote server
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/60—Digital content management, e.g. content distribution
    • H04L2209/603—Digital right managament [DRM]

Definitions

  • the invention relates to a method of providing data integrity authentication and data protection, in which a set of data fragments is protected by a signature.
  • the invention further relates to a system for providing data integrity authentication and data protection, the system being arranged to receive and handle data fragments, of which a set of data fragments can be protected by a signature.
  • the invention further relates to a signature device for providing data integrity authentication and data protection, the device being arranged to handle data fragments, and the device being arranged to generate a signature to protect a set of data fragments.
  • the invention further relates to a verification device for verifying data integrity authentication and data protection, the device being arranged to handle data fragments, and the device being arranged to verify a signature to protect a set of data fragments.
  • the invention further relates to a signal comprising data fragments, of which a set of data fragments is protected by a signature.
  • the invention further relates to a computer program product for implementing such a method.
  • EPGs electronic program guides
  • the general term content typically comprises things like music, songs, movies, television programs, pictures and the likes, but can also refer to individual scenes, MPEG-4 objects, and so on.
  • Metadata for content items is available from a variety of sources. Metadata can be included with a broadcast stream (e.g. as MPEG-2 tables) or downloaded from external databases. For example, a television receiver or Personal Digital Recorder may be provided with an Internet connection, which allows the device to access metadata made available over the World Wide Web.
  • a broadcast stream e.g. as MPEG-2 tables
  • downloaded from external databases e.g. as MPEG-2 tables
  • a television receiver or Personal Digital Recorder may be provided with an Internet connection, which allows the device to access metadata made available over the World Wide Web.
  • This metadata generally comprises information such as title, artist, genre and so on, and may also contain a unique content reference identifier (CRID), sometimes also called a content reference identifier.
  • CRID unique content reference identifier
  • each individual content item can be uniquely identified.
  • further information can be retrieved from a database. For example, a user can select a content item which he wishes to see from the EPG, even though the time and place of broadcast are not yet known. Using the CRID, the system can then retrieve the time and place of broadcast of the content item when this information becomes available.
  • the CRID is not restricted to broadcast transmissions of content. It could also refer to a location on the Internet, or to any other source.
  • the purpose of content resolution is to allow acquisition of a specific instance of a specific item of content. For example a user may want to record an episode of a television series, but he does not necessarily know when and where that episode will become available. He can then use his personal digital recorder (PDR) or similar device to enter a reference to the episode or series by means of the CRID.
  • PDR personal digital recorder
  • a CRID may refer to an entire series or to an individual episode thereof.
  • the PDR Having received a CRID for a content item, the PDR tries to obtain the location of the content item.
  • This information is called a locator and it contains the date, time and channel on which the content item will be broadcast. The user however does not need to be aware of this.
  • the PDR waits for the specified date and time and then records the episode as it is broadcast on the specified channel.
  • the locator indicates a location on the Internet or the like, the PDR can simply retrieve the content from the indicated location as soon as it becomes available.
  • the TV-Anytime standardization body provides a standardized Content Reference ID. See TV-Anytime Forum, www.tv-anytime.org, Specification Series: S-4, on Content Referencing (Normative), Document SP004V11, 14 Apr. 2001, later version SP004V12, 28 Jun. 2002, ETSI TS 102 822-4.
  • This document specifies that the CRID contains an ⁇ authority> field indicating the body that created the CRID.
  • An authority will also provide the ability for the CRID to be resolved into locators or other CRIDs.
  • a locator is the name for locations in time and space of content.
  • the CRID further contains a ⁇ data> field which is a free format string that is compliant with the definition of Uniform Resource Identifiers (URIs) as given in “RFC2396, Uniform Resource Identifiers (URI): Generic Syntax.” This string should be meaningful to the authority given by the ⁇ authority> field.
  • URIs Uniform Resource Identifiers
  • the CRID is used for location resolution, which can be defined as the process of translating a CRID into other CRID(s) or locators. For instance, a CRID for an entire TV series could be translated into a series of CRIDs for the individual episodes of that series. Location resolution may be done in the recording device (typically a Personal Digital Recorder or PDR) or remotely. A resolution provider does location resolution. Resolution providers use resolving authority records (RARs) to be identified and located. A RAR includes at least an ⁇ authority> field, corresponding to a body that creates CRIDs.
  • RARs resolving authority records
  • a RAR also contains a URL and the resolution provider name.
  • the URL points to the location where resolution information can be found.
  • the resolution provider name contains the name of the body that is providing location resolution.
  • TV-Anytime information and services are valuable so protection of this information is important. Protection includes the issue of source authentication and spoofing; the integrity of the data is to be protected.
  • the receiver may want to check if the data is indeed coming from the expected source and hasn't been changed by a third party.
  • a third party can change the metadata or CRID table, it can make the PDR record other information then was intended including commercials, trailers or just other content. This is also very annoying for a user and may lower the trust the user has in the system.
  • the PDR may therefore want to check whether the content came from a trusted source. If the data can be authenticated to originate from one source even when it is distributed using different channels, the PDR can use this to make a choice when confronted with multiple sources of the same content. An example of this is when the data of a certain BBC show can be authenticated as being generated by the BBC, this raises the likelihood that this information is correct.
  • the source of the TV-Anytime data and metadata is not always the creator of the data.
  • the source could be a service provider gathering and grouping information from different sources. It could be useful to check who created the data and whether the data has been changed. In this case, the data that is received will hold parts provided by different sources.
  • each data fragment of the set comprises its own unique identifier
  • the signature comprises references to the respective unique identifiers of the data fragments of the set.
  • the invention describes a system in which signatures will be provided separately and references to unique identifiers will indicate which data fragments are covered by the signature.
  • the at least one identifier uniquely identifies a data fragment in order to enable the linking between data fragments and the signature. This is done by providing an (optional) field that is added to each data fragment for identification of that data fragment. An existing field could be used if all data fragments have such a field that uniquely identifies each data fragment. Otherwise, a special signature identifier could be added to each data fragment as an optional field. When this field is present it is a unique identification of that data fragment instance within the data.
  • a signature may refer to multiple data fragments, such that sets of data fragments are signed instead of individual data fragments. This has the further advantage that it is more efficient.
  • An embodiment of the method according to the invention is described in claim 3 .
  • An advantage is that only the hashes are needed to compute or verify a signature. This is especially advantageous (reduction of computation time) if the same data fragments are being used in multiple signatures.
  • XML clearly separates individual data fragments enabling the identification of data fragments in a standardized way. Data fragments can be collected in one or more XML documents.
  • Data fragments to be signed can be approached by the use of a transform function according to RFC3275) that removes the data fragments that are not considered for this signature.
  • the transform function refers to the data fragments using the unique identifier.
  • Such an index file would then link references to the appropriate signature files using the unique identifier to support a search option.
  • This table provides a grouping between the data that is signed and the list of signatures.
  • the DNS name is an easy and understandable choice for the unique identification of the organization.
  • the unique identifier identifies a data fragment, it does not define where this data fragment can be found within the total data.
  • the reference should preferably also be accompanied by a location indicator.
  • An embodiment of the method according to the invention is described in claim 14 .
  • An implementation indicates the path through the data that has to be taken in order to locate the data fragment.
  • An embodiment of the method according to the invention is described in claim 16 .
  • a different approach is to define a wrapper around the data document that further includes the signature information and possibly some other elements that need signing. In this way, the original data is included in the wrapper without changes, except for the addition of possibly missing unique identifiers.
  • a suitably defined wrapper may be extended to allow additional data to be included in the signed data.
  • the system according to the invention is characterized in that the system comprises means to receive and handle data fragments of the subset, each data fragment identified by a unique identifier, the system further comprises at least one of -means for associating a signature with the protected data fragments of the set using their unique identifiers, -means for verifying a signature associated with the set using the unique identifiers of the protected data fragments, and -means for generating a signature that references the protected data fragments by their unique identifiers.
  • the signature device is characterized in that the device is arranged to address each data fragment to be protected by a unique identifier included in the data fragment, and the device is arranged to generate signature information comprising the unique identifiers to refer to the data fragments of the set.
  • the verification device is characterized in that the device is arranged to address each data fragment to be protected by a unique identifier included in the data fragment, and the device is arranged to verify signature information comprising the unique identifiers to refer to the data fragments of the set.
  • each data fragment of the set comprises its own unique identifier
  • the signature comprises references to the unique identifiers of the data fragments of the set.
  • the invention is further characterized by a computer program product for implementing the method of claim 1 .
  • FIG. 1 schematically illustrates the process of content resolution
  • FIG. 2 shows the different fragments as defined by TV-Anytime
  • FIG. 3 a , 3 b , and 3 c show XML definitions and examples related to the unique identifier
  • FIG. 4 a , 4 b , and 4 c show XML definitions and examples related to the signature information
  • FIG. 5 shows XML definitions and examples related to the key information.
  • FIG. 1 schematically illustrates the process of content resolution.
  • the PDR 10 is instructed to record a content item identified by a Content Reference Identifier CRID.
  • Instructing the PDR to record a content item, or in other words scheduling that content item for recording can be done in a variety of ways.
  • a presently common way is that the user manually indicates, e.g. by selecting the content item in the EPG, that the content item is to be recorded.
  • the computer program product 12 with the computer-readable instructions in a suitable format such as a optical disc or solid state memory can be used to store or distribute the program instructions implementing the invention.
  • the PDR may be equipped to determine kinds of content items that the consumer may be interested in. This is known as user profiling or recommender systems. By keeping track of content items which the consumer views, and employing an implicit and/or explicit rating system for such content items, it becomes possible to predict with varying degrees of accuracy which other content items the consumer may be interested in. It then becomes possible to automatically record content items which are likely to be of interest to the consumer. Such content items could then be recorded by the PDR. Many techniques for user profiling are known in the art. When the PDR determines, using user profiling, that a particular content item may be of interest, it schedules the content item for recording.
  • the CRID for the content item is used to facilitate automatic recording of the content item.
  • the CRID could be entered manually by the user, or be the result of selecting a content item through an Electronic Program Guide. This second option assumes that the CRID is somehow provided to the PDR together with other metadata used in the EPG by a CRID provider entity 13 .
  • the user could perform a search using for example the title of the content item in a metadata database, and select the desired content item from the search results. The CRID is then supplied to the PDR by the search engine.
  • a trailer or preview for a movie could be broadcast with the CRID embedded in the content of the commercial in some way (e.g. a watermark).
  • the user could then press a button on his remote control, television or PDR.
  • the PDR or television then extracts the CRID from the content of the commercial.
  • the PDR tries to obtain locator information for the content item, using the CRID as input.
  • This locator information is not necessarily always available.
  • the CRID may refer to a movie that has only recently been released in movie theaters. This movie is not likely to be broadcast on television in the near future, so it cannot be scheduled using EPG information. In such a case, the PDR should regularly try to obtain the locator, as the locator may become available later (e.g. a year later, when the movie is going to be broadcast on TV).
  • the CRID could also refer to a TV series, which is then resolved into a number of CRIDs for individual episodes of that series. It is possible that no locator information is available for some episodes. Here the PDR should also regularly retry to obtain the locator(s) for those episodes.
  • Location resolution involves mapping a location-independent content reference (the CRID) to its location in time (e.g. scheduled transmission time in a broadcast system) and space (e.g. TV channel, IP address). As explained above, these locations in time and space are referred to as “locators.”
  • the process of location resolution may happen inside the PDR or by using a physically remote server, such as a server on the Internet.
  • the CRID essentially contains opaque information, which it cannot resolve to a location without external assistance.
  • a Resolution Provider (RP) which provider locator information for CRIDs is provided to solve this problem.
  • RP Resolution Provider
  • the name of the authority is present in the CRID in the ⁇ authority> field, as explained above. This name is present in the form of a registered Internet domain name. It is possible for an Resolution Authority (RA) 15 to be found on the Internet using the domain name resolution process specified in the TV-Anytime specification SP004.
  • Each RA will require one or more Resolving Authority Records (RAR) to exist in the PDR for location resolution to take place.
  • RAR Resolving Authority Records
  • Each resolving authority record will need to be placed inside some sort of transport specific container which allows the PDR to know that this is a RAR. In the case of multiple records for the same authority, the PDR can choose to just use one of them, or try them all in turn.
  • the Resolving Authority Record (RAR) contains the information that identifies the RAs where content reference resolution information can be found.
  • the PDR determines which RP to use to resolve a particular CRID.
  • the PDR then submits a request for a location accompanied by a CRID to the Resolution Provider in question.
  • the Resolution Provider returns the locator information (assuming this information is available in that RP, of course).
  • the PDR can then access the content source and obtain the content item.
  • a content item may have more than one locator, for example if it is broadcast multiple times or available from multiple providers.
  • the PDR may then choose which locator to use, or prompt the user to make a selection.
  • the PDR waits for the specified date and time and then records the episode as it is broadcast on the specified channel.
  • the locator indicates a location on the Internet or the like, the PDR can simply retrieve the content from the indicated location as soon as it becomes available.
  • the PDR may comprise local storage such as a sufficiently large hard disk, and/or a device such as a DVD+RW writer.
  • the storage on which content items are stored needs not be local to the PDR, but may also be an external device such as a hard disk or a file server connected to the PDR via a home network.
  • a content item may be erased when the rights associated with the content item require such erasure. Also, some content items may not come with a right to record the item at all, or with a right that permits viewing only for a limited amount of time, or for a limited number of times.
  • the PDR should then erase the content item when the limit is exceeded, or refuse further access to the content until further rights are obtained that permit further access.
  • the content as received in the client box can be protected during transport by encryption. Before the content can be accessed, the content has to be decrypted. This process is controlled by the DRM or conditional access (CA) system.
  • TV-Anytime specification distinguishes between two different distribution methods: unidirectional and bidirectional.
  • TV-Anytime data is another stream in the broadcast stream with the normal signaling in place. Access to this stream can be protected using traditional conditional access systems, such as scrambling.
  • conditional access systems such as scrambling.
  • the conditional access system is identified and the messages carrying the conditional access information related to this stream are indicated.
  • Most digital broadcast systems use the MPEG-2 transport stream format (ISO/IEC 13818-1:1996(E), Information technology—Generic coding of moving pictures and associated audio information: Systems, First Edition, 1996-04-15).
  • the source of the TV-Anytime data is not always the creator of the data.
  • the source could be a service provider gathering and grouping information from different sources. Data can also be retrieved by the PDR from different sources. Thus, data that is received will hold parts provided by different sources. It could be useful to check who created to data and whether the data has been changed. This is done using signatures.
  • TVA metadata is provided as TVA fragments.
  • a TVA fragment is “a self contained atomic portion of the metadata”.
  • the smallest TVA metadata element that can be signed is a fragment.
  • the invention includes the definition of a label that is used to uniquely identify a TV-Anytime fragment in order to link the fragment to the signature. This is done by providing an optional field that is added to each TV-Anytime fragment.
  • this unique identifier is a unique identification of that fragment instance within this instance of metadata. The unique identifier should allow for easy tracing of the fragment within the metadata. This is required in order to find the different fragments that are needed to calculate a signature.
  • FIG. 2 shows the different fragments as defined by TV-Anytime.
  • all fragments have an optional or compulsory unique identifier for identification of a fragment.
  • TVAID is used in these fragments.
  • TVAIDs are used to “indicate uniqueness within a metadata description”. Although they seem to match the requirement for an identifier, they're only unique for a particular type of TVAID. e.g. a serviceID and segmentID could be the same within a particular metadata description.
  • the TVAID is used as reference identifier. This provides a unique identifier if the reference used in the signature indicates the context (e.g. service or segment).
  • the TVAID can be used if all fragments have one (or one is added) and it is determined that using the TVAID a unique reference to the fragment can be made within this instance of the TVA metadata.
  • a special TVA signature identifier is added to all fragments as an optional field. Either the TVAID or a new identifier is defined for this purpose.
  • the XML definition for an example identifier added to each TVA fragment that uniquely identifies a fragment among other fragments of the same type within the metadata (or within the relevant instance of the metadata) is shown in FIG. 3 a .
  • an example of a format for all TV-Anytime fragments could be to add a TVASignatureId attribute, formally defined as shown in FIG. 3 b.
  • a further advantageous variation of the invention ensures that the identifier is unique among fragments of the same type within the metadata by starting the identifier with the DNS name (or another unique identification) of the organization responsible of generating the fragment. This would also allow the client to detect what organization published the data.
  • An example TVASignatureId of a fragment published by company MyCompany could look as shown in FIG. 3 c.
  • Labeling each individual fragment or set of fragments and signing using references has the advantage that, when properly chosen, the reference would provide a link from the signature file to the fragment. Furthermore, the unique identifier provides a link between the fragment(s) and the data containing the signature.
  • TVA metadata is expressed in XML
  • a transport neutral way of expressing signatures that allows the signatures to be carried in the same data structure could be to include the signatures in the TVA schema.
  • TV-Anytime metadata is expressed in XML a suitable choice would be xmldsig, but other XML-based signature schemes can of course be defined as well.
  • the signature can be stored according to the xmldsig standard. Additionally, references to the unique identifier indicate which fragments are used to calculate a signature. Although the unique identifier identifies a fragment, it does not define where this fragment can be found within the total TVAMain. In order to facilitate the searching of the correct fragment within the metadata, the reference (defined in URI format according to RFC2396) should preferably also indicate the location. An extension of the invention therefore adds an optional location indicator to indicate the path through the metadata that has to be taken in order to locate the fragment.
  • a compliant example definition of the fragment URI including the unique identifier according to the invention can be defined as “tva:// ⁇ path>/ ⁇ TVASignatureId>” where ⁇ path> is the path from the start of the metadata towards the fragment, and TVAID is the identifier of the fragment.
  • Some examples are “tva://TVAMain/aap.org;132423”, “tva://TVAMain/ClassificationTable/CSAlias/publisher.com;122314”, and “tva://TVAMain/ProgramDescription/ProgramLocationTable/Schedule/metwt.org;320984”.
  • the first example illustrates that it is also possible to sign the complete TVAMain metadata document. In this case, all of TVAMain without the certificate and signature parts should be considered.
  • the unique identifier (such as TVASignatureId) is used in URIs to refer to a fragment, the identifier should be compatible with the formatting restrictions placed upon URIs as described in RFC2396. Furthermore, in order to ease the parsing of the URI no slashes (“/”) are used in the TVASignatureId.
  • the TVASignatureTable will provide a grouping between the data that is signed and the list of signatures; an example definition of such a table is shown in FIG. 4 a and FIG. 4 b .
  • this definition there is an option to include other TV-anytime metadata documents such as the ContentReferencingTable and ResolvingAuthorityRecordTable in this table. This has the advantage that, as they can only occur once, no unique identifier is needed for that metadata in the table and in the URI.
  • a TVASignatureTable is defined as shown in FIG. 4 c .
  • Zero or more signatures can be present.
  • the implementation of the delivery system will have to take care that the relevant fragments and signature are present when needed. In the bi-directional delivery system missing fragments or missing signatures can be downloaded.
  • a different way to define the fragments that need to be signed is by defining a transform function (according to RFC3275) that removes some or all elements from the metadata that are not considered for a signature.
  • the corresponding public key of the party that applied the signature(s) is needed. Distribution of these keys can be done in several ways. They can be hard coded in the device, but as this would raise problems if new keys are used or when current keys are compromised, the most common way of distribution of the keys is by incorporating them into a so-called certificate-chain (“Applied Cryptography Second Edition: protocols, algorithms, and source code in C, Bruce Schneier, Wiley, 1996”). So in order to check the signature, in addition to the signatures data, also the certificates of the parties providing signatures are required.
  • TVASignature allows the inclusion of one or more ds:KeyInfo objects in order to support the carriage of such certificates within the TVASignature wrapper.
  • a XML complex type indicating a list of KeyInfo objects with accompanying identifiers is shown in FIG. 5 .
  • the reference URI is defined as “tva://KeyInfoListTable/ ⁇ Identifier>”, where ⁇ Identifier> is the identifier indicated in the KeyInfoWrapperType. Some examples are therefore “tva://KeyInfoListTable/132423”, “tva://KeyInfoListTable/435432h”, and “tva://KeyInfoListTable/MyKeyInfo”.
  • Public keys can also be stored using X509 certificates, where the subject field in the 509 certificate may too contain the organization name or a different unique identification identifying the key source. This provides an additional way to make sure the data is really signed by the organization that claims to have signed it.
  • Signatures can be generated using a suitable algorithm, such as DSA or RSA signature generation algorithms.
  • references to the unique identifier can either implicitly or explicitly be included in the data to be signed.
  • signatures can also be used to protect different tables used in a system.
  • More elaborate search options could be provided by adding signature index files. Such an index file would than link unique identifiers to the appropriate signature files.
  • the metadata object (such as TVAMain) is expanded with the signature fragments so it will include the signature information. This is advantageous if the signatures are distributed and accessed within the normal distribution system as is indicated by TV-Anytime.
  • signatures are provided separately, for example by definition of a wrapper that includes the TVAMain and possibly some other elements that need signing. This is advantageous as this would not change the current metadata specification and it would also allow to include other TV-Anytime documents (e.g. ContentReferencingTable and ResolvingAuthorityRecordTable).
  • the system according to the invention supports signatures over single or multiple fragments. This has the advantage that it enables to sign a set of fragments, which is more efficient than signing each individual fragment. It has the further advantage that it remains as much as possible compatible with the unidirectional as well as the bidirectional distribution system, while minimizing the level of change upon the existing metadata specification.
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • the word “comprising” does not exclude the presence of elements or steps other than those listed in a claim.
  • the word “a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • the invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Storage Device Security (AREA)
  • Television Systems (AREA)
US10/531,616 2002-10-18 2003-10-17 Method, system, device , signal and computer program product for metadata protection in tv-anytime Abandoned US20060047952A1 (en)

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WO2004036870A3 (en) 2004-07-29
RU2005115106A (ru) 2005-10-10
CN1706169A (zh) 2005-12-07
JP2006503367A (ja) 2006-01-26
AU2003269360A1 (en) 2004-05-04
AU2003269360A8 (en) 2004-05-04
EP1557023A2 (en) 2005-07-27
WO2004036870A2 (en) 2004-04-29
US20100178033A1 (en) 2010-07-15
US8869298B2 (en) 2014-10-21
KR20050061545A (ko) 2005-06-22
BR0315403A (pt) 2005-08-16
PL376310A1 (en) 2005-12-27

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