Source: http://www.google.fr/patents/US9277295
Timestamp: 2017-11-19 16:18:24
Document Index: 478280890

Matched Legal Cases: ['art=0', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 200880108773', 'Application No. 08', 'Application No. 07', 'Application No. 07', 'Application No. 07', 'Application No. 08', 'Application No. 07', 'Application No. 07', 'Application No. 07798909', 'Application No. 07798908', 'Application No. 07', 'Application No. 03', 'Application No. 07', 'Application No. 07', 'Application No. 05', 'Application No. 07', 'Application No. 07', 'Application No. 07798910', 'Application No. 11169374', 'Application No. 11169374', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 03']

Brevet US9277295 - Securing media content using interchangeable encryption key - Google Brevets
An embodiment of a system for securing media content includes a digital media device comprising a memory associated with a secure element. The memory contains a private key and storage for at least one group key. The private key is used to decrypt transmissions from a remote access control system that...http://www.google.fr/patents/US9277295?utm_source=gb-gplus-shareBrevet US9277295 - Securing media content using interchangeable encryption key
Numéro de publication US9277295 B2
Numéro de demande US 11/454,421
Autre référence de publication CA2655114A1, CA2655114C, EP2052342A2, EP2375359A2, EP2375359A3, US20070294178, US20160142772, WO2007146763A2, WO2007146763A3
Numéro de publication 11454421, 454421, US 9277295 B2, US 9277295B2, US-B2-9277295, US9277295 B2, US9277295B2
Inventeurs Howard G. Pinder, Andrew D. Maholski
Citations de brevets (281), Citations hors brevets (153), Classifications (24), Événements juridiques (3)
Securing media content using interchangeable encryption key
US 9277295 B2
An embodiment of a system for securing media content includes a digital media device comprising a memory associated with a secure element. The memory contains a private key and storage for at least one group key. The private key is used to decrypt transmissions from a remote access control system that are encrypted by a corresponding public key. The digital media device further comprises logic configured to respond to a first message received from the remote access control system encrypted by the public key and including a first group key, the logic responding to the first message by decrypting the first group key and storing the first group key in the memory of the secure element. The digital media device further comprises logic configured to decrypt a content key with the first group key. The content key is used to encrypt media content stored on a medium accessible by the digital media device.
maintaining, by a server, a group key, wherein the group key is used to encrypt and decrypt content on at least one digital media recording device located remotely from the server;
associating, by the server, digital media recording devices with a customer account;
associating, by the server, the maintained group key to the associated customer account;
associating, by the server, a group record with the associated maintained group key;
associating, by the server, the associated group record with the customer account;
adding, by the server, a first digital media recording device to the associated group record with the maintained group key on the server, wherein adding the first media recording device comprises:
receiving, by the server, a request to add the first digital media device to the group record associated with the customer account;
receiving, by the server, an identification of the first digital media device and an identification of the group record;
creating, by the server, an entry for a record for the first digital media device in the received identified group record;
generating, by the server, a device record for the first digital media device using the created entry;
encrypting, by the server, the maintained group key with a public key of the first digital media recording device, wherein the public key is associated with a private device key of the first digital media recording device; and
signing, by the server, the encrypted maintained group key;
generating, by the server, a group key entitlement management message (EMM), wherein the EMM comprises private conditional access information about authority of the first digital recording media device to receive service; and
transmitting, by the server, the generated EMM to secure microprocessor of the first digital media recording device at a memory location on the secure microprocessor which cannot be accessed from outside of the secure microprocessor.
encrypting media content recorded by the first digital media recording device using a content key generated by the first digital media recording device;
encrypting the content key using the group key; and
storing the encrypted media content and the encrypted content key on a first storage device associated with the first digital media recording device.
transmitting the EMM from the server to a second digital media recording device having a common media authorization to the first digital recording device; and
storing the EMM within memory associated with the second digital media recording device.
connecting the first storage device having the encrypted media content and the encrypted content key to the second digital recording device;
decrypting the encrypted content key using the group key stored within the memory associated with the second device to obtain the content key; and
5. The method of claim 1, wherein maintaining the group key comprises maintaining the group key for the plurality of digital media recording devices, the plurality of digital media recording devices located at a user premises.
6. The method of claim 1, wherein receiving, by the server, the request to add the first digital media device to the group record comprises receiving the request from a billing system associated with a service provided to the customer.
7. The method of claim 1, wherein receiving, by the server, the request to add the first digital media device to the group record comprises receiving the request to add a digital video recorder (DVR) to the group record.
8. A system for securing media content comprising:
a memory coupled to the processor storing instructions that when executed by the processor causes the processor to perform a method comprising:
maintaining a group key, wherein the group key is used to encrypt and decrypt content on at least one digital media recording device located remotely from the server;
associating digital media recording devices with a customer account;
associating the maintained group key to the associated customer account;
associating a group record with the associated maintained group key;
associating the associated group record with the customer account;
adding a first digital media recording device to the associated group record with the maintained group key on the server, wherein adding the first media recording device comprises;
receiving a request to add the first digital media device to the group record associated with the customer account;
receiving an identification of the first digital media device and an identification of the group record;
creating an entry for a record for the first digital media device in the received identified group record;
generating a device record for the first digital media device using the created entry;
encrypting the maintained group key with a public key of the first digital media recording device, wherein the public key is associated with a private device key of the first digital media recording device; and
signing the encrypted maintained group key;
generating a group key entitlement management message (EMM), wherein the EMM comprises private conditional access information about the authority of the first digital recording media device to receive service; and
transmitting the generated EMM to a secure microprocessor of the first digital media recording device at a memory location on the secure microprocessor which cannot be accessed from outside of the secure microprocessor.
9. A system for securing media content comprising:
a first digital media recording device;
a server connected to the digital media device, wherein the server comprises a non-transitory medium containing instructions which when executed causes the server to perform the steps of:
associating a group record with the maintained group key;
associating the group record with the associated customer account;
adding the first digital media recording device to the associated group record with the maintained group key on the server;
encrypting the maintained group key with a public key of the first digital media recording device, wherein the public key is associated with a private device key of the first digital media recording device;
10. The system of claim 9, wherein instructions which when executed further causes the secure microprocessor of the first digital media device to perform the step of authenticating the EMM.
11. The system of claim 10, wherein the instructions which when executed further causes the secure microprocessor of the first digital media device to perform the step of decrypting the EMM to obtain the group key.
12. The system of claim 10, wherein the instructions which when executed further causes the secure microprocessor of the first digital media device to perform the step of storing the group key to the memory location.
13. The system of claim 9, wherein the first digital media device is a digital video recorder (DVR).
14. The system of claim 9, wherein the first digital media device is located at a remote location from the server.
15. The system of claim 9, wherein the instructions which when executed further causes the first digital media device to perform the step of receiving media content from the headend device.
16. The system of claim 15, wherein the media content received from the headend device is encrypted with the group key.
17. The system of claim 16, wherein the instructions which when executed further causes the first digital media device to perform the step of decrypting the media content using the group key.
18. The system of claim 17, wherein the instructions which when executed further causes the first digital media device to perform the step of storing the decrypted media content on a storage device.
19. The system of claim 18, wherein the instructions when executed further causes the first digital media device to perform the step of sending the decrypted media content to a display device associated with the first digital media device.
The present disclosure generally relates to securing data, and more particularly, to securing data associated with a digital media device using an encryption key.
The media data stored to the DVR can be encrypted in order to protect the media content from unauthorized playback. A secure microprocessor can be used to protect the encryption keys that are used by DVR encryption processors to encrypt the content. The secure microprocessor includes a private key stored therein, useful for decrypting data encrypted using an associated public key. The secure microprocessor can also be used to generate a content instance key of suitable strength to encrypt the media data on the storage device. The content instance key could be a random value (or passphrase, etc.) for example. The content instance key is then encrypted using the secure microprocessor's public key and stored on the storage device in association with the encrypted content and any other digital access rights elements.
Upon request for playback of the media content embodied in the media data, the encrypted content instance key associated with the media data is retrieved from the storage device and decrypted by the private key of the secure microprocessor. The media data can then be retrieved and the content key can then be used to decrypt the media data for playback.
However, because the encrypted content instance key is associated with the private key of a particular secure microprocessor, when a DVR fails it may not be possible to access the secure microprocessor to allow decryption of the stored content from the failed DVR's storage device. Thus, a cable subscriber's library of recorded and encrypted media content becomes inaccessible for playback. This may be so, even though the user may be legally entitled to play the media content, e.g., after paying for that right. Additionally, tying the media content to a particular DVR introduces problems with respect to the sharing of digital media between devices. For example, in some cases, a subscriber may be authorized to view content recorded by a first DVR within the subscriber household on another, second DVR within the subscriber household. However, because the encrypted media content is tied to the secure microprocessor in the first DVR used to record the media, such sharing becomes difficult.
Further, subscribers to media services, such as cable-television, among others, may be authorized and de-authorized for the viewing of media content based on a subscriber's subscription status. For example, this change in authorization may be carried out through the transmission of media access signals from a cable-operator's head-end system to an associated set-top box. However, these media-access signals may simply set a flag or other non-secure logical switch within the set-top that allows or disallows the specified service. However, those wishing to steal the service may be able to easily overcome such trivial barriers, allowing the media data already stored on the DVR associated with the set-top box to be accessible.
Therefore, what is needed are systems and methods that can potentially address one or more of the aforementioned deficiencies.
FIG. 1 depicts a block diagram of an arrangement of a secure data delivery system in which embodiments of the described systems and methods for securing media content using an interchangeable encryption key may be implemented.
FIG. 2 depicts a block diagram of selected system components of a cable head-end of the secure delivery system of FIG. 1.
FIG. 3 depicts a block diagram of selected system components of an exemplary embodiment of a remote device such as the digital-video recorder (DVR) of FIG. 1.
FIG. 4 depicts a flow diagram illustrating an embodiment of a process for creating a group record having a group key within the database of the cable head-end of FIG. 2.
FIG. 5 depicts a flow diagram of an embodiment of a process for associating a trusted remote device record with a group record and for downloading a group key to a remote device.
FIG. 6 depicts a data flow diagram applying the process embodiments of FIGS. 4 and 5 to embodiments of the secure data delivery system of FIG. 1.
FIG. 7 depicts a flow diagram of a process for encrypting media data using a group key stored within the DVR of FIG. 3.
FIG. 8 depicts a data flow diagram applying the method embodiments of FIG. 7 to embodiments of the secure data delivery system of FIG. 1.
FIG. 9 depicts a flow diagram of an exemplary process for decrypting media data using a group key.
FIG. 10 depicts an exemplary data flow diagram applying the process embodiments of FIG. 9 to embodiments of the secure data delivery system of FIG. 1.
FIG. 1 depicts a secure data delivery system 100 in which embodiments of the described systems and methods for securing media content using interchangeable encryption keys may be implemented. System 100 may be used, among other purposes, for coordinating the exchange of information capable of being used to secure media content stored on devices located remote from a media provider, such as a cable-television or digital satellite television provider, for example.
An instance of media content (or media programming, etc.) could be, for example, a television show (e.g. an episode of Smallville). A series of media programming could be, for example, a number of episodes of a television show (e.g. the last five recordings of Smallville). The media content can be received and recorded by the remote devices. For example, the media content can be stored to a storage medium as media data. In some instances, such media data is encoded audio and/or video signals, among other potential representations of the media content that is in a form suitable for processing by the DVR 108.
Looking to FIG. 1, according to some embodiments, cable head-end 102 may deliver media content and/or the information capable of being used to secure media content stored on devices located remote from a media provider over a transmission medium 106, which may be one or more of twisted-pair telephone wire, coaxial cable, optical fiber, over-the-air waves, etc. The remote devices may be located at, for example, user premises 104.
Accordingly, the media content may be received by a remote device within the user premises 104 that is capable of receiving and, possibly, decoding the media content. The remote device may, for example, form part of, be associated with, or be integrated in one or more of a cable-television set-top box, a television, portable device, digital video recorder (DVR), personal video recorder (PVR), a personal digital recorder (PDR), and/or a personal computer, laptop computer, or personal digital assistant (PDA), among others.
According to some embodiments, the remote device comprises a set-top box having an integrated media recording capabilities. For the purposes of illustration, one such device configured to execute media recording capabilities is DVR 108. DVR 108 may be configured to record received media content and store associated media data on a storage medium. According to some embodiments, the media data may be later accessed for playback on a playback device, such as television 110, at a later time. The playback device could also be one or more of a computer monitor, an audio receiver, or other device capable of emitting sound or images pertaining to the media content.
According to some embodiments, a user premises 104 can have multiple DVRs. Depicted in the upper right portion of FIG. 1, for example, a second DVR 108 a is associated with the respective user premises. DVR 108 a, according to some embodiments, is associated with a respective display device 110 a. In some instances, DVR 108 a is in communication with DVR 108 over communication medium 112. For example, the communication medium 112 could be twisted pair, Ethernet, or any type of wired or wireless network. DVR108 and DVR 108 a, and any other DVRs that may be present at user premises 104, may communicate directly or through one or more other devices in a local-area-network (LAN). In some cases, DVRs 108 and 108 a can share media content and/or programming guide information, among other DVR related information, over the communication medium 112.
Although embodiments are described within the environment of a cable-television system, it should be understood that other media delivery and/or receiving devices are intended to fall within the scope of the invention. For example, the media source could be a satellite television provider or even a media server on the Internet. The remote device could be a satellite television decoder or a computer configured to receive the media content. The media recorder could be any device, such as a personal computer, that is configured with media recording and/or playback ability. Additionally, although the media content may be described as comprising video and audio content, some embodiments may include only audio or only video. The media content could even comprise text or other forms of media. Further, in some instances, non-media information (e.g. security keys, digital-rights management (DRM) information, etc.) may be transmitted along with the media content.
FIG. 2 depicts a block diagram of the cable-head end 102 of the secure data delivery system 100 of FIG. 1. Associated with the cable head-end 102 may be a transaction encryption device (TED) 202, a digital network control system (DNCS) 204, and a media delivery system 206. Cable-head end 102 may be in communication with the remote media recording device, which can be DVR 108. It should be understood that, in accordance with some embodiments, omitted from FIG. 3 are a number of conventional components, known to those skilled in the art, that are unnecessary to explain the operation of the disclosed systems and methods for securing media content using an interchangeable encryption key.
In general, TED 202 can be used by other components associated with the cable-head end to securely encrypt and decrypt data. To this end, TED 202 may include an encryption/decryption processing element 208 which can be in communication with a memory 210 used for holding keys, such as a conditional access authority (CAA) key 212 and a private entitlement agent (EA) key 220. CAA key 212 can be, for example, a passphrase of suitable strength, among other possible key types. Private entitlement agent key 220 can be used for, among other uses, signing transmissions from the cable head-end 102 to enable remote devices having a corresponding public entitlement agent (EA) key to verify the source of received transmissions.
Processing element 208 can also be configured to generate a random key, which may be referenced herein as a group key or interchangeable key. The group key could be, for example, among other encryption key types, a triple data encryption Standard (3DES) key. Accordingly, it should be understood that the group key may actually comprise one or more keys. Additionally, although the group key may be described herein as a symmetric key, some embodiments may use asymmetric keys. More specifics of the operation of TED 202 will be discussed in detail below.
DNCS 204, among other functions, can be used for maintaining records pertaining to the remote devices (e.g. DVR's, set-top boxes, etc.). According to some embodiments, the remote devices may be grouped based on the type of services to which devices associated with the group are granted access. For example, the services could correspond to the types of media content that the remote devices are authorized to playback. However, it should be appreciated that other embodiments may group the remote devices based on other criteria.
According to one embodiment, the group could be a subscriber account. Thus, the devices associated with a particular subscriber account can be granted access to the same media content (e.g. media content delivered on one or more particular channels, purchased movies, etc.). According to such an embodiment, a billing system may store pertinent details about a subscriber account within the DNCS upon subscribing to a cable-television service. The subscriber account could represent, for example, an account associated with a specific person, business entity, home, etc. that is authorized to receive media content from the cable television provider. Once the subscriber account is set up, one or more remote devices may then be associated with the account.
Accordingly, looking to FIG. 2, group records 216 can be used to maintain records about a particular group (e.g. a subscriber account, etc.) and the records related to one or more remote devices can be referenced as device records 218. Although depicted separately, group records 216 and device records 218 may be viewed as potentially being linked once a particular device record is associated with a group record. Additionally, although a single database 214 is depicted, it should be understood that the respective records may be spread across two or more physical or logical databases. More specific detail as to the operation of DNCS 204 will be discussed in later portions of this document.
Media delivery system 206 can provide media content signals from the head-end (or central office, server, etc.) to any of the plurality of remote devices, such as DVR 108. The content signals may comprise any of a number of programs (i.e. television shows, or other defined portion of a media signal), and each program provided can be referred to as an “instance” of media content. In some cases, media delivery system 206 may be configured to encrypt the instances of media content (i.e. using TED 202 or other encryption devices). In some cases, such encryption may encrypt every four seconds of media data, for example, to be delivered over transmission medium 106 (FIG. 1) to the remote device. If the subscriber associated with the device is entitled to watch the program of the encrypted instance, the remote device may then decrypt the encrypted instance. An overview of the encryption and decryption of the signals to and from a cable head-end can be found in U.S. Pat. No. 6,292,568, which is hereby incorporated by reference in its entirety.
FIG. 3 is a block diagram depicting selected system components of an exemplary embodiment of the DVR 108 of FIG. 1. Omitted from FIG. 3 are, in accordance with some embodiments, a number of conventional components known to those skilled in the art that are unnecessary to explain the operation of the disclosed systems and methods for securing media content using an interchangeable encryption key. FIG. 3 depicts several components commonly communicating through a local bus 300. For example, DVR 108 may include a communications interface 302 for receiving video, audio and other media signals from a media signal source, such as the cable head-end 102 (FIGS. 1 and 2). The communication interface 302 may include a tuner system (not depicted) which could include, for example, a tuner for receiving and selecting one or more selected channels of media signals. Such a tuner system can tune to a particular television station, and the media signals associated with this station can be recorded by the DVR 108.
DVR 108 can further include at least one processor 306 for controlling the operations of the DVR 108 and an output system 308 for driving a playback device (e.g., television 110). An input system 310 can receive user inputs provided via a wired or wireless input device such as, for example, a hand-held remote control, a transmitter with buttons or keys located on the exterior of the DVR, and/or a keyboard.
Network interface 312 can transmit and/or receive data over a network such as a LAN, WAN, or the Internet. For example, data may be transferred to/from another DVR, received from a media signal source, or from a centralized server through network interface 312. Such data could be media signals and or other data, such as programming information, or other data capable of being stored and or displayed to the user. Network interface 312 may comprise, for example, an Ethernet interface, an IEEE-1394 interface, a USB (Universal Serial Bus) interface, a serial interface, a parallel interface, a wireless radio frequency (RF) interface, a telephone line interface, a power line interface, a coaxial cable interface, and/or an infrared (IR) interface, among others.
Memory 314, which may include volatile and/or non-volatile memory, can store one or more programmed software applications, herein referred to as applications, which contain instructions that may be executed by processor 306 under the direction of operating system 324. Input data used by an application can be stored in memory 314 and read by processor 306 as needed during the course of the application's execution. This input data may be data stored in memory 314 by a secondary application or other source, either internal or external to DVR 108, or may be data that was created with the application at the time it was generated as a software application program.
Internal storage 318 may comprise a recordable medium and may be a number of devices available for non-volatile data storage, such as a hard disk drive (HDD), optical drive, or flash memory, for example. Internal storage 318 may be used for storing media data, such as encoded media signals generated from those signals received through communication interface 302 and/or network interface 312. According to some embodiments, it should be understood that media programming can be digitally encoded before being stored on recordable medium by the DVR itself or by means external from the DVR, such as the media signal source or a cable set-top box. Internal storage may also be used for storing non-media data, such as encryption keys and DRM information associated with stored media data.
Like internal storage 318, external storage 320 may also comprise a recordable medium and may be a number of devices available for non-volatile data storage, such as an HDD, optical drive, or flash memory, for example. However, unlike internal storage 218, which is located within the DVR enclosure (i.e. housing) 319, external storage 320 can be removably attached to DVR 102 through a communications interface 322, which could be any number of wireless or wired interfaces, for example.
Although only one external storage device may be used in some embodiments, it is contemplated that external storage 320 may comprise a plurality of storage devices 320 a-320 n. For example, devices 320 a-320 n could be a plurality of HDDs. It can be appreciated that the one or more HDDs could be daisy chained, or otherwise linked, to communicate with DVR 108 over the communications interface 322.
Although memory 314, internal storage 318, and/or external storage 320 have been described as potentially performing particular functions, according to some embodiments, these particular functions could be shared, or carried out completely, by any other of the memory and/or storage devices.
Communication interface 322 could be a bus operating under the Advanced Technology Attachment (ATA) standard, and more specifically, the Serial-ATA (i.e. SATA) standard version 2.5, which is available from the Serial ATA International Organization and is hereby incorporated by reference in its entirety. According to such an embodiment, DVR 108 may include a communications interface comprising an attachment port on the housing 319 of the DVR that cooperatively mates with the plug of external storage 320. A cable complying with the high-speed bus (i.e. a cable complying with the SATA standards) may provide the transmission medium between external storage 320 and the DVR 108. According to other embodiments, communications interface 322 could be a bus complying with the IEEE 1394 (Firewire), the Universal Serial Bus (USB), or IEEE 802.11 standards. It can be appreciated that a number of other communication interfaces 322 could be used.
One, or both of, internal storage 318 and/or external storage 320 could be used for recording media data to a transportable medium that is capable of being easily moved between a plurality of remote devices. For example, internal storage 318 and/or external storage 320 may be an optical drive configured to read and/or record to/from an optical medium. The transportable medium could also be flash memory such as used in USB thumb drives, smart digital (SD) memory or compact flash (CF) memory, among others. Accordingly, DVR 108 may be configured to record media data, which could comprise moving or copying media data from other storage devices, to the transportable medium. DVR 108 may also be configured to read media data from a transportable medium. Accordingly, the media data may be stored to a transportable medium, and the media data on the transportable medium may then be read by other devices, such as another DVR associated with a customer account. In that the media data is encrypted, embodiments disclosed herein describe systems and methods for sharing the media content between remote devices while maintaining the ability to decrypt the underlying media data by authorized devices.
User input received during the course of execution of any processes implemented by DVR 108 may be received from an input device (not shown) via input system 310, transmitted through the bus 300, temporarily stored within memory 314, and communicated to processor 306. Data generated by an application can be stored in memory 314 by processor 306 during the course of the application's execution. Availability, location, and amount of data generated by one application for consumption by another application can be communicated by messages through the services of operating system 324.
Under user instruction, DVR application 328 can perform the general tasks of recording and/or playback of received programs, among other tasks. DVR application 328 can also provide a navigation framework for services provided by DVR 108. For example DVR application 328 can register for, and in some case reserve, certain user inputs related to navigational keys such as channel increment/decrement, last channel, favorite channel, etc. DVR application 328 also provides users with television (or other programming) related menu options that correspond to DVR functions such as, for example, providing an interactive program guide, blocking a channel or a group of channels from being displayed in a channel menu, recording particular channels, playback of recorded shows, etc.
Portions of DVR application 328 and/or operating system 324 may also facilitate the encoding and decoding of media data and/or other information used in the described systems and methods for securing media content using an interchangeable encryption key. Specifically, operating system 324 or DVR application 328 may use a secure element, depicted as secure microprocessor 330, and/or DVR content decrypt/encrypt element 342 to perform such encryption and/or decryption.
For example, DVR content decrypt/encrypt element 342 includes a processor for performing encryption and/or decryption of media content. For example, decrypt/encrypt element 342 can decrypt the media content received from the head-end 102 or from other DVR components, such as internal storage 318 or external storage 320. DVR content decrypt/encrypt element 342 also encrypts and/or re-encrypts media content for storage to the internal or external storage mediums.
According to some embodiments, DVR content decrypt/encrypt element 342 can obtain keys for performing such encryption and decryption of media content from secure microprocessor 330. Secure microprocessor 330 may include a processor, such as encryptor/decryptor 332, for encrypting and decrypting keys used by DVR content decrypt/encrypt element 342 to perform encryption and decryption of media data.
Secure microprocessor 330 may include a memory 334 for storing a number of keys for encryption and/or decryption functions. For example, memory 334 can include a device key 336 stored therein, and one or more group key storage locations 338 a-338 n for the storage of respective group keys, and an entitlement agent (EA) key 340.
Device key 336 could be, for example, among others, a private key of the DVR 108. Device key 336 can be used to decrypt data encrypted with a public key associated with the private device key 336. According to such embodiments, device key 336 is typically kept from being exposed outside of the secure microprocessor 330 in clear form.
The one or more group key storage locations 338 can be used to hold group keys associated with a particular group of devices authorized to access (i.e., decrypt, decode, etc.) common media content. Although referred to as a “group” key, it should be understood that the group key could be associated with any number of devices, including zero. For example, a group could be a customer account. Although a “group key” may be assigned to this group, there may not be any devices yet associated with the customer account.
A number of potential embodiments for using group keys are described below. Nonetheless, in such embodiments, the group keys can be downloaded and stored into the group key storage locations 338 a-338 n and can also be replaced and/or deleted from these storage locations. Accordingly, the group keys are interchangeable. It should be understood that even though the group keys are interchangeable, in some embodiments the interchangeable keys may never, or seldom, change once stored within group key storage 338. Storage locations 338 a-338 n may comprise non-volatile memory locations, but could be volatile if the security policy of the service provider requires that the group keys be re-supplied and stored to the group key storage locations upon a reset of the DVR 108, for example. For that matter, the group keys may be restored to group key locations 338 periodically, according to predefined policies (e.g. of the service provider).
Public EA Key 340 is a public key associated with private EA key 220. Accordingly, public EA Key 340 can be used to verify that transmissions received from the cable-head end (or other transmissions signed with private EA key 220) are from a trusted source.
Secure microprocessor 330 can also include a controller 342 for controlling the operations of encryptor/decryptor 332 and/or for storing and/or retrieving the keys to/from memory 314.
The applications executed by DVR 108 can comprise executable instructions for implementing logical functions. The applications can be embodied in any computer-readable medium for use by or in connection with an instruction execution system. The instruction execution system may be, for example, a computer-based system, a processor-containing system, or any other system capable of executing instructions. In the context of this document, a “computer-readable medium” can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
The computer-readable medium can be, for example, but is not limited to, an electronic, solid-state, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, device, or propagation medium, either internal to DVR 108 or externally connected to the DVR 108 via one or more communication ports or network interfaces. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic) having one or more wires, a portable computer diskette (magnetic), a hard drive storage device (magnetic), a random access memory (RAM) (solid-state device), a read-only memory (ROM) (solid-state device), an erasable programmable read-only memory (EPROM or Flash memory) (multiple devices), an optical fiber (optical), and a portable compact disc read-only memory (CDROM) (optical). Note that the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
Now that a general overview of the various components of system 100 have been described, FIG. 4 depicts a flow diagram illustrating an embodiment of a method 400 for creating a group record 216 having a group key within database 214. For example, in some embodiments, the steps are executed by components within the environment of the secure data delivery system 100.
At block 402, a group record is created. For example, as explained above, the group record may correspond to a subscriber account that is created in response to a request from a billing system among other possibilities. At block 404, a secure group key is requested that can be associated with the group record. For example, in one embodiment, DNCS 204 requests the secure group key from TED 202. At block 406, the requested secure group key KGROUP is generated. At block 408 the group key KGROUP is encrypted to ensure that it is not exposed. For example, the group key KGROUP can be encrypted with the CAA Storage key 212, which may be referred to as KCAA, to produce the encrypted group key E(KCAA(KGROUP)).
At block 410 the requested, encrypted group key E(KCAA(KGROUP)) is returned to the requestor. For example, according to one embodiment, the encrypted group key E(KCAA(KGROUP)) is transmitted from TED 202 to DNCS 214. At block 412, the encrypted group key E(KCAA(KGROUP)) can be stored and associated with the group record. For example, one embodiment stores the encrypted group key in database 214 of DNCS 204.
Accordingly, method 400 generates and associates a group key, in encrypted form, with a particular group record. As described, the group could represent an account, a household, or other entity having common media access rights.
One or more remote devices can be associated with a group record. For example, a number of DVRs can be associated with a specific customer account. Accordingly, a device record can be created for each device and each device record can then be associated with a respective group record. These device records may contain a group key that has been encrypted with the respective device's public key. The encrypted group key can then be transmitted to the device, decrypted, and stored within the device's secure microprocessor. These operations are, again, completed without allowing exposure to the group key in an unencrypted form.
Thus, reference may now be directed to FIG. 5, which depicts a flow diagram illustrating an embodiment of a method 500 for associating a trusted remote device record with a group record, and for downloading the group key to the device. At block 502 a request to add a device record can be received. For example, the request can originate from a billing system and be received by DNCS 204. The request to add the trusted device can include the identification of a specified device and specified group record to be associated with one another. Accordingly, at block 504 an entry for the new device record can be made within, or otherwise associated with, the group record. The device record can include a public key, KDEVICE-PUBLIC, that is associated with the private device key 336, KDEVICE-PRIVATE, of the respective remote device. Accordingly, in some embodiments, a device record 218 having such information is stored within database 214.
Once the device record is generated, the group key to be associated with the device can be stored within the device record. However, in order to remain secure, the group key is stored in an encrypted form that can be decrypted by the remote device. Accordingly, at block 508 the group key stored in the respective group record can be retrieved and decrypted. For example, group key E(KCAA(KGROUP)), encrypted with the CAA storage key 212, is decrypted to obtain the group key KGROUP in the clear. At block 510 the device's public key KDEVICE-PUBLIC, is used to encrypt group key KGROUP to generate E(KDEVICE-PUBLIC(KGROUP)). Such encryption and decryption can be performed by TED 202, for example.
At block 512, the encrypted group key can be signed to produce a group key Entitlement Management Message (EMM), which is a signed message holding the group key (encrypted by the device's public key). For example, a private entitlement agent key KEA-PRIVATE, may be used by TED 202 to sign the EMM. In general, an EMM comprises an encrypted message containing private conditional access information about the authority for a device to receive services, such as those provided by a cable or satellite television operator. Accordingly, this group key EMM may serve the purpose of providing a receiving remote device with the information needed to conditionally decrypt media content received by and/or stored in the DVR 108. That is, the conditional access can be provided by the particular group key that is capable of being used to decrypt media data encrypted with the group key.
At block 514, the group key EMM for the new device can be stored with the device record, and at block 516 the home key EMM can be transmitted to the remote device. At block 518, the signature of the EMM can be authenticated. For example, the secure microprocessor of the receiving remote device may use a public entitlement agent key KEA-PUBLIC associated with the private key used to sign the EMM (i.e. KEA-PRIVATE) to authenticate the EMM. If the EMM is successfully authenticated, at block 520 the EMM can be decrypted to obtain the group key KGROUP in clear (i.e. unencrypted) form. For example, the EMM can be decrypted using the secure element private key KDEVICE-PRIVATE to recover the group key KGROUP. At block 522 the group key can be stored into a free memory location associated with the device. For example, the device secure microprocessor can stores the group key KGROUP into memory location 338, which cannot be accessed from outside of the secure microprocessor. Accordingly, using the above process, the group key KGROUP can be transmitted from the head-end to the remote device without exposing the key in an unencrypted form.
Reference may also be made to FIG. 6, which depicts an exemplary data flow diagram 600 that applies the methods 400 and 500 to embodiments of the secure data delivery system 100. For example, a group record 216 can be created in database 214 (i.e. in response to a request from a billing system, etc.). At block 602, TED 202 can generate a group key KGROUP for association with the newly created group record 216. However, in order to avoid non-secure exposure of the group key, at block 604 TED 202 encrypts group key KGROUP with CAA Storage Key KCAA, to produce encrypted group key 606 E(KCAA(KGROUP)), which can be stored into the group record 216 of database 214.
When a trusted remote device (i.e. PVR, DVR, set-top box, etc.) is to be associated with the group, an associated device record 218 is created (i.e. at the request of a billing system, etc.) and associated with a specified group record 216. The device record may include a public key 608, referred to as KDEVICE-PUBLIC, that is associated with a private device key 336 of the remote device. The device key 336 of the remote device may also be referred to as KDEVICE-PRIVATE.
TED 202 retrieves the group key, encrypted with the CAA key 212, from database 214, denoted in FIG. 6 as E(KCAA(KGROUP)), for decryption at block 610. TED 202 decrypts E(KCAA(KGROUP)), using the CAA key 212 (i.e. KCAA) to obtain the group key KGROUP. TED 202 can retrieve the device's public key KDEVICE-PUBLIC from database 214 and, at block 612, the group key KGROUP can be encrypted using the remote device's public key KDEVICE-PUBLIC to generate E(KDEVICE-PUBLIC(KGROUP)). At block 614, TED 202 signs the encrypted group key to produce a group key Entitlement Management Message (EMM), which is a signed message including the group key, as encrypted by the device's public key.
The group key EMM 616 for the new device can be stored into the associated device record 218. The DNCS 204 (FIG. 2) can then retrieve the group key EMM 616 from database 214 and transmit the group key EMM to the remote device where, at block 618, the device secure microprocessor 330 authenticates the EMM using the public key KEA-PUBLIC 340 associated with KEA-PRIVATE 220. If the EMM is successfully authenticated, at block 620 the device secure microprocessor decrypts E(KDEVICE-PUBLIC (KGROUP)) using the secure element private key KDEVICE-PRIVATE 336, thereby recovering the group key KGROUP. The device secure microprocessor can then store the group key KGROUP into memory location 338. Memory location 338 cannot be accessed from outside of the secure microprocessor, allowing KGROUP to remain completely secure. Accordingly, the group key KGROUP can be transmitted from a head-end to the remote device without exposing the group key in an unencrypted form.
Now that systems and methods have been described for provisioning the group key to a particular remote device, such as DVR 108, methods for encrypting and decrypting content using the group key are described. For example, FIG. 7 depicts a flow diagram of a process 700 for encrypting media data using the group key stored within the secure microprocessor of the DVR 108. At block 702 an instance of media content can be delivered to the remote device from a media source. For example, the media delivery system 206 of cable head-end 102 can deliver media content to DVR 108.
In some cases, the media content delivered to the device may be encrypted. Accordingly, if necessary, at block 704 the media content is decrypted into clear media content such as with DVR content decrypt/encrypt element 342. Additionally, according to some embodiments, the clear media content has been digitally encoded, either at the head-end or within the remote device. Thus, the clear media content may be embodied within media data, which is in the clear from encryption.
At block 706, a random number can be generated to use as a content key KC for encrypting the particular instance of media data that is, or will be, stored on a storage device associated with the remote device. At block 708 the instance of media data can be encrypted with the generated content key KC. Content key KC can also be used later for decrypting the associated instance of media data. At block 710 the encrypted media data can be stored to a storage medium. For example, the media data could be stored to internal storage 318 or external storage 320, among other data storage locations. At block 712 the instance's respective content key KC can be encrypted with a group key KGROUP to produce an encrypted content key E(KGROUP(KC)). At block 714, the encrypted content key E(KGROUP(KC)) can be securely stored on a storage medium and associated with the media data instance.
Reference may also be made to FIG. 8, which depicts an exemplary data flow diagram 800 that applies the embodiments of method 700 to embodiments of the secure data delivery system 100. According to the embodiments of FIG. 8, the media source is depicted as cable head-end 102, which transmits an instance of encrypted media content 802 to the DVR 108. The instance of encrypted media content 802 is passed to DVR content encrypt/decrypt element 342 for decryption into clear media data 806 at block 804.
At block 808, the secure microprocessor 330 can generate a random number to use as a content key KC for encrypting (or, rather, re-encrypting) the particular instance of media data.
According to some embodiments, in order to avoid the clear media data 806 being exposed in clear form, DVR content encrypt/decrypt element 342 encrypts clear media data 806 with the content key KC generated by secure microprocessor 330. Thus, a secure tunnel is formed in order to pass content key KC from secure microprocessor 330 to DVR content encrypt/decrypt element 342. Specifically, at block 812, the content key KC is encrypted and passed to DVR content encrypt/decrypt element 342. At key tunnel decrypt block 814, DVR content encrypt/decrypt element 342 can decrypt content key KC, to provide the content key KC in clear form. The content key can then be used to encrypt the clear media data 806 at block 816.
Accordingly, at block 816 DVR content encrypt/decrypt element 342 encrypts the instance of media data with the content key KC, and the encrypted media data 818 (i.e. E(KC(MEDIA-DATA))) can be stored to a storage device, such as internal storage 318. At block 820 the secure microprocessor 330 encrypts the instance's content key KC with a group key KGROUP stored in the secure microprocessor 330 to produce an encrypted content key 822 (i.e. E(KGROUP(KC))) and stores the encrypted content key 822 securely to a storage device, such as internal storage 318.
Now that systems and methods for encrypting an instance of media content using a group key have been disclosed, system and method embodiments for decrypting media content using the group key are described. For example, FIG. 9 depicts a flow diagram of a process 900 for decrypting media data using the group key.
At block 902 a request to decrypt an instance of media data previously encrypted with an associated content key KC is received. For example, DVR application 328 may receive a request from a user to view a particular television show corresponding to the instance of encrypted media data 818 (FIG. 8). At block 904, the appropriate key for decrypting the media data is determined and the encrypted content key E(KGROUP(KC)) is retrieved from the storage medium. The DVR 108 may, for example, keep a table or other data structure that associates the encrypted content keys E(KGROUP(KC)) with the instances of encrypted media data. Accordingly, such a table can be accessed to find the encrypted content key E(KGROUP(KC)) associated with the instance of encrypted media data.
At block 906 the encrypted content key E(KGROUP(KC)) can be decrypted with the group key to retrieve the content key KC. At block 908 an instance of media content encrypted with content key KC is retrieved. At block 910 the instance of media data can be decrypted with its associated content key Kc to obtain the instance of media data in the clear. The decrypted media can, for example, be used for decoding and/or display on television 110 or for other purposes.
Reference may also be made to FIG. 10, which depicts an exemplary data flow diagram 1000 that applies method 900 to embodiments of the secure data delivery system 100. Upon receiving a request for a particular instance of media content, at block 1002 DVR 108 can receive and decrypt the encrypted content key E(KGROUP(KC)) associated with the encrypted media data E(KC(MEDIA-DATA)) from the storage medium.
At block 1004 the DVR content encrypt/decrypt element 342 receives and decrypts the instance of media data E(KC(MEDIA-DATA)) with the associated content key KC to produce clear media data 1006. The decrypted media data can then be used for decoding and display on a display device, such as television 110.
According to some embodiments, similar to the encryption tunnel described with respect to FIG. 8, secure microprocessor 330 encrypts content key KC at block 812 in order to securely deliver the content key to DVR content encrypt/decrypt element 342. DVR content encrypt/decrypt element 342 can then decrypt content key KC using key tunnel decrypt 814 in order to decrypt the instance of media content at block 1004, as described above.
Accordingly, systems and methods have been described for securing media content using an interchangeable encryption key, which has been referred to from time to time as a group key. Such systems and methods can be used to allow multiple remote devices that share an identical group key to also share associated stored media data. That is, any media data encrypted using a specified group key can be decrypted by any device having access to that same group key.
According to one embodiment, the group can correspond to a customer account. For example, assuming that each DVR associated with a customer account is authorized to decrypt and view common content, a single group key could be shared among the DVRs associated with the customer account (i.e. using method embodiment 500).
Such an embodiment can be used to share media content between a number of digital media devices (i.e. DVRs 108 and 108 a) at a user premises 104 (FIG. 1) or any other digital media devices which share the same group key. Such media content could be shared over the communications medium 112 or via a transportable storage medium (e.g. via external storage 320, among other transportable storage mediums). Using such an approach, a first DVR may record media content to external storage 320 and the associated encrypted content key can also be stored to external storage 320. The encrypted media content and associated encrypted content key can then be transferred to the second DVR (i.e. external storage 320 can be attached to the second DVR or the encrypted media content and encrypted content key can be transferred over communications medium 112). Because both the first and second DVR have matching group keys, the second DVR can then receive and decrypt the associated encrypted content key with the group key in order to recover the encrypted media content.
Although one embodiment may share common group keys among devices having a common customer account, other schemes are intended to be included within the scope of this disclosure. For example, based on rules determined by the media provider (e.g. cable operator, etc.), the keys could be shared between groups of customers having different subscriber accounts but having common subscription plans. Such a plan could, for example, allow the remote devices of friends sharing the same media access provisions to be capable of sharing media data between their respective remote devices. Such media data could be shared over a LAN, wide-area network (WAN), or via attachment of a portable storage medium, such as, a recordable optical disk, or an external HDD, among others.
Thus, one potential benefit is that media content encrypted by another device can be decrypted and used by any other device sharing the interchangeable group key. Such a benefit can be helpful in the case that an end user upgrades or replaces the remote device. In such a case, the media data encrypted a first remote device can be transferred to, or otherwise made available to, the new remote device. The new remote device can then be provided with the one or more group keys of the old remote device (i.e. according to an embodiment of process 500), thereby allowing the media data content to be decrypted by the new remote device (i.e. according to an embodiment of process 900).
Just as one or more group keys can be provided to a particular remote device, the one or more group keys can be removed and/or replaced. For example, an EMM may be transmitted to a remote device that clears any or all of the group keys, or otherwise replaces one or more group keys with keys that are unable to decrypt the content keys previously used to encrypt at least some of the media data stored on an associated storage device.
Thus, a media provider could remotely control whether a user can access any of the stored media content on the device by selective removal of any of the group keys. Thus, upon receiving an un-subscription request from a user, a cable television provider could remove the ability to view content already stored on the storage device instantaneously and securely. Because the group keys can be provisioned based on the access rights of the customer, such deactivation may merely cause only selected media content to become unavailable. For example, the cable operator may provision group keys for users that subscribe to premium television channels, and the instance keys used to record media content from these premium television channels can be selectively encrypted with the associated group key. If such a “premium content” group key is then removed from the remote device upon a customer's unsubscription from the premium television channel, content previously recorded is no longer accessible by the user. Such remote deactivation could also be used to remotely and securely de-authorize non-paying subscribers.
Conditional language, such as, among others, “can,” “could,” “might,” or “may,” unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments could include, but others do not include, certain features, elements and/or steps. Thus, such conditional language is not generally intended to imply that features, elements and/or steps are in any way required for one or more embodiments or that one or more embodiments necessarily include logic for deciding, with or without user input or prompting, whether these features, elements and/or steps are included or are to be performed in any particular embodiment.
US4633391 21 oct. 1983 30 déc. 1986 Storage Technology Partners Ii Extended index for digital information storage and retrieval device
US5224161 8 nov. 1989 29 juin 1993 Laboratoir Europeen De Recherches Electroniques Avancees, Societe En Nom Collectif Method of scrambling and of unscrambling composite video signals, and device for implementation
US5299263 4 mars 1993 29 mars 1994 Bell Communications Research, Inc. Two-way public key authentication and key agreement for low-cost terminals
US5349641 12 août 1993 20 sept. 1994 France Telecom Establissement Autonome De Droit Public Process for the transmission and reception of conditional access programmes with a reduced programme switching time
US5422953 5 mai 1993 6 juin 1995 Fischer; Addison M. Personal date/time notary device
US5721777 29 déc. 1994 24 févr. 1998 Lucent Technologies Inc. Escrow key management system for accessing encrypted data with portable cryptographic modules
US5872846 7 nov. 1996 16 févr. 1999 Mci Communications Corporation System and method for providing security in data communication systems
US5905522 31 août 1995 18 mai 1999 Microsoft Corporation Resource allocation method for interactive televideo system
US5940391 25 nov. 1997 17 août 1999 International Business Machines Corporation Method and apparatus for reconfigurable and adaptive stream multicast
US5961603 22 sept. 1997 5 oct. 1999 Worldgate Communications, Inc. Access system and method for providing interactive access to an information source through a networked distribution system
US5987572 29 sept. 1997 16 nov. 1999 Intel Corporation Method and apparatus employing a dynamic encryption interface between a processor and a memory
US5999970 10 avr. 1996 7 déc. 1999 World Gate Communications, Llc Access system and method for providing interactive access to an information source through a television distribution system
US6012068 30 juin 1997 4 janv. 2000 International Business Machines Corporation Media manager for access to multiple media types
US6020982 8 oct. 1993 1 févr. 2000 Kabushiki Kaisha Toshiba Image data processing apparatus for digitally reproducing optical image data
US6108002 4 août 1998 22 août 2000 Fujitsu Limited Program reservation method in a CATV
US6148082 14 janv. 1998 14 nov. 2000 Skystream Corporation Scrambling and descrambling control word control in a remultiplexer for video bearing transport streams
US6154817 16 déc. 1996 28 nov. 2000 Cheyenne Software International Sales Corp. Device and method for managing storage media
US6209090 29 mai 1997 27 mars 2001 Sol Aisenberg Method and apparatus for providing secure time stamps for documents and computer files
US6230269 4 mars 1998 8 mai 2001 Microsoft Corporation Distributed authentication system and method
US6324548 22 juil. 1999 27 nov. 2001 Unisys Corporation Database backup and recovery using separate history files for database backup and audit backup
US6345307 12 nov. 1999 5 févr. 2002 General Instrument Corporation Method and apparatus for compressing hypertext transfer protocol (HTTP) messages
US6401243 14 avr. 1997 4 juin 2002 Sony Corporation Two-way information transmission system, two-way information transmission method, and subscriber terminal
US6484318 26 août 1997 19 nov. 2002 Pioneer Electronic Corporation CATV communication system and method for the internet connection
US6532593 15 août 2000 11 mars 2003 General Instrument Corporation Transcoding for consumer set-top storage application
US6549577 25 sept. 1998 15 avr. 2003 Sarnoff Corporation Computational resource allocation in an information stream decoder
US6636953 29 mai 2001 21 oct. 2003 Matsushita Electric Co., Ltd. Receiving apparatus that receives and accumulates broadcast contents and makes contents available according to user requests
US6694025 2 juin 1999 17 févr. 2004 Koninklijke Philips Electronics N.V. Method and apparatus for secure distribution of public/private key pairs
US6727944 26 févr. 1999 27 avr. 2004 Fuji Photo Film Co., Ltd Digital electronic still-video camera and method of controlling operation of same
US6802077 10 févr. 2000 5 oct. 2004 Scientific-Atlanta, Inc. Method for a pay-per-view referral
US6961858 16 déc. 2002 1 nov. 2005 Entriq, Inc. Method and system to secure content for distribution via a network
US6970564 7 juin 2000 29 nov. 2005 Sony Corporation Data multiplexing device, program distribution system, program transmission system, pay broadcast system, program transmission method, conditional access system, and data reception device
US7020635 16 janv. 2002 28 mars 2006 Line 6, Inc System and method of secure electronic commerce transactions including tracking and recording the distribution and usage of assets
US7062658 10 sept. 2001 13 juin 2006 Cisco Technology, Inc Secure digital appliance and method for protecting digital content
US7080049 21 sept. 2001 18 juil. 2006 Paymentone Corporation Method and system for processing a transaction
US7089579 6 déc. 1999 8 août 2006 Tvworks, Llc System for transporting MPEG video as streaming video in an HTML web page
US7090128 8 sept. 2004 15 août 2006 Systems And Software Enterprises, Inc. Mobile electronic newsstand
US7155609 14 juin 2001 26 déc. 2006 Microsoft Corporation Key exchange mechanism for streaming protected media content
US7200868 12 sept. 2002 3 avr. 2007 Scientific-Atlanta, Inc. Apparatus for encryption key management
US7212725 28 mai 2002 1 mai 2007 Kabushiki Kaisha Toshiba Recording/reproducing apparatus and picture recording reservation method of recording/reproducing apparatus
US7233959 3 juin 2002 19 juin 2007 International Business Machines Corporation Life-cycle management engine
US7363326 7 janv. 2004 22 avr. 2008 Burnside Acquisition, Llc Archive with timestamps and deletion management
US7587502 12 mai 2006 8 sept. 2009 Yahoo! Inc. Enabling rent/buy redirection in invitation to an online service
US7602913 18 août 2004 13 oct. 2009 Scientific - Atlanta, Inc. Retrieval and transfer of encrypted hard drive content from DVR set-top box utilizing second DVR set-top box
US7602914 18 août 2004 13 oct. 2009 Scientific-Atlanta, Inc. Utilization of encrypted hard drive content by one DVR set-top box when recorded by another
US7630499 18 août 2004 8 déc. 2009 Scientific-Atlanta, Inc. Retrieval and transfer of encrypted hard drive content from DVR set-top boxes
US7636846 5 juin 1998 22 déc. 2009 Uqe Llc Global conditional access system for broadcast services
US7650442 1 févr. 2006 19 janv. 2010 Koninklijke Philips Electronics N.V. Transfer of media content from a personal video recorder to an external storage device
US7711586 30 sept. 2005 4 mai 2010 Rearden Corporation Method and system for unused ticket management
US7953715 4 oct. 2007 31 mai 2011 Seiko Epson Corporation File processing device, file transmission device, and corresponding methods
US7971261 12 juin 2007 28 juin 2011 Microsoft Corporation Domain management for digital media
US8732849 22 août 2011 20 mai 2014 Fujitsu Limited Content server device and content delivery method
US8856951 26 oct. 2012 7 oct. 2014 Canon Kabushiki Kaisha License management system and method
US20010006400 5 déc. 2000 5 juil. 2001 Hiroaki Kubo Camera
US20020018130 11 janv. 2001 14 févr. 2002 Kazunori Suemoto Apparatus for capturing image, its method of recording data, and recording medium
US20020069172 14 sept. 2001 6 juin 2002 Barry Omshehe Method and system for administering a concurrent user licensing agreement on a manufacturing/process control information portal server
US20020078153 2 nov. 2001 20 juin 2002 Chit Chung Providing secure, instantaneous, directory-integrated, multiparty, communications services
US20020099663 * 31 oct. 2001 25 juil. 2002 Kenji Yoshino Content delivery system and content delivery method
US20020101990 27 févr. 2001 1 août 2002 Harumi Morino Data receiving apparatus and data reproducing apparatus
US20020104097 27 mars 2002 1 août 2002 Scientific-Atlanta, Inc System and method for a communication terminal to manage memory and maintain a current application version for multiple applications
US20020116708 18 sept. 2001 22 août 2002 Morris Richard M. User interface for a streaming media client
US20020144067 20 déc. 2001 3 oct. 2002 Jeong Jae Yoon Apparatus and method for moving contents
US20020184457 29 mai 2001 5 déc. 2002 Aki Yuasa Receiving apparatus that receives and accumulates broadcast contents and makes contents available according to user requests
US20030005446 29 juin 2001 2 janv. 2003 Microsoft Corporation Remotely accessing and programming a set top box
US20030005454 29 juin 2001 2 janv. 2003 Rodriguez Arturo A. System and method for archiving multiple downloaded recordable media content
US20030009668 14 juin 2001 9 janv. 2003 Chan Shannon J. Key exchange mechanism for streaming protected media content
US20030093680 13 nov. 2001 15 mai 2003 International Business Machines Corporation Methods, apparatus and computer programs performing a mutual challenge-response authentication protocol using operating system capabilities
US20030110234 8 nov. 2001 12 juin 2003 Lightsurf Technologies, Inc. System and methodology for delivering media to multiple disparate client devices based on their capabilities
US20030161617 26 févr. 2003 28 août 2003 Lg Electronics Inc. Method of managing recorded still pictures on a recording medium
US20030200337 12 mars 2003 23 oct. 2003 Dilithium Networks, Inc. Method and system for improved transcoding of information through a telecommunication network
US20030233558 13 juin 2002 18 déc. 2003 Microsoft Corporation System and method for securely booting from a network
US20040022307 31 juil. 2002 5 févr. 2004 Broadcom Corporation Turbo-coding DOCSIS information for sate ilite communication
US20040052377 12 sept. 2002 18 mars 2004 Mattox Mark D. Apparatus for encryption key management
US20040088328 6 août 2003 6 mai 2004 David Cook System and method for providing media samples on-line in response to media related searches on the internet
US20040098591 15 nov. 2002 20 mai 2004 Fahrny James W. Secure hardware device authentication method
US20040098603 6 juin 2003 20 mai 2004 Corinne Le Buhan Method and device for the recognition of the origin of encrypted data broadcasting
US20040128499 30 déc. 2002 1 juil. 2004 General Instrument Corporation System for digital rights management using distributed provisioning and authentication
US20040187014 18 mars 2003 23 sept. 2004 Molaro Donald Joseph Method and system for implementing digital rights management
US20040193921 13 août 2003 30 sept. 2004 Byrne Barry A. Systems and methods for authenticating a user to a web server
US20040228175 31 mars 2004 18 nov. 2004 Candelore Brant L. Configurable cableCARD
US20040236804 20 févr. 2004 25 nov. 2004 Pieter Bots Monitoring and data exchange procedure for a peripheral data storage unit
US20040237100 22 juin 2004 25 nov. 2004 Pinder Howard G. Validating client-receivers
US20050091173 * 24 oct. 2003 28 avr. 2005 Nokia Corporation Method and system for content distribution
US20050100162 11 nov. 2003 12 mai 2005 Jukka Alve System and method for using DRM to control conditional access to DVB content
US20050102513 10 nov. 2003 12 mai 2005 Nokia Corporation Enforcing authorized domains with domain membership vouchers
US20050105732 12 nov. 2004 19 mai 2005 Hutchings George T. Systems and methods for delivering pre-encrypted content to a subscriber terminal
US20050111835 26 nov. 2003 26 mai 2005 Friel Joseph T. Digital video recorder with background transcoder
US20050180568 31 mars 2005 18 août 2005 Krause Edward A. Time-multiplexed multi-program encryption system
US20050201559 23 avr. 2003 15 sept. 2005 Van Der Heijden Gerardus Wilhelmus T. Conditional access system
US20050213147 * 4 mars 2005 29 sept. 2005 Fuji Photo Film Co., Ltd. Image file sharing method, and digital camera and center server used in image file sharing system
US20050232593 14 mars 2005 20 oct. 2005 Sanyo Electric Co., Ltd. Recording/reproduction device and method thereof
US20050237396 26 avr. 2005 27 oct. 2005 Kabushiki Kaisha Toshiba Data recording apparatus and electronic camera
US20050240708 21 avr. 2004 27 oct. 2005 Shaver Charles N Systems and methods for providing internal universal serial bus ports
US20050240974 28 mars 2005 27 oct. 2005 Takuji Hiramoto Processing terminal, receiving terminal and received data processing system
US20060013566 7 juil. 2005 19 janv. 2006 Sony Corporation Content recording apparatus, content playback apparatus, content recording method, content playback method, and computer program
US20060020786 20 juil. 2004 26 janv. 2006 William Helms Technique for securely communicating and storing programming material in a trusted domain
US20060039256 25 mai 2005 23 févr. 2006 Taku Nakamura Storing apparatus
US20060039559 18 août 2004 23 févr. 2006 Wasilewski Anthony J Retrieval and transfer of encrypted hard drive content from DVR set-top box utilizing second DVR set-top box
US20060039560 18 août 2004 23 févr. 2006 Wasilewski Anthony J Utilization of encrypted hard drive content by one DVR set-top box when recorded by another
US20060041905 18 août 2004 23 févr. 2006 Wasilewski Anthony J Retrieval and transfer of encrypted hard drive content from DVR set-top boxes
US20060072752 27 sept. 2005 6 avr. 2006 Hiroyuki Nakano Broadcast receiving apparatus and broadcast receiving method
US20060074807 6 oct. 2004 6 avr. 2006 Sony Corporation Method and system for content sharing and authentication between multiple devices
US20060093325 * 1 nov. 2005 4 mai 2006 Mitsuhiro Imai Data recording controller, method of controlling data recording controller, program, data recording system, and data recording device
US20060109854 22 nov. 2004 25 mai 2006 Cancel Ramon C Systems and methods to share information between digital video recorders
US20060156382 14 juil. 2005 13 juil. 2006 Tetsuro Motoyama Approach for deleting electronic documents on network devices using document retention policies
US20060179478 * 15 déc. 2005 10 août 2006 Samsung Electronics Co., Ltd. Method of controlling content access and method of obtaining content key using the same
US20060184733 18 avr. 2006 17 août 2006 Yasutomo Yamamoto Apparatus and method for reallocating logical to physical disk devices using a storage controller, with access frequency and sequential access ratio calculations and display
US20060187951 1 févr. 2005 24 août 2006 Intel Corporation Apparatus and method of controlling transmission of response frame
US20060190408 24 févr. 2005 24 août 2006 Cook Johanna M System and method for customized bundled license generation
US20060200865 * 7 mars 2005 7 sept. 2006 International Business Machines Corporation System, service, and method for enabling authorized use of distributed content on a protected media
US20060262926 26 juin 2006 23 nov. 2006 Candelore Brant L Time division partial encryption
US20060269060 26 juin 2006 30 nov. 2006 Candelore Brant L Partial encryption and PID mapping
US20060294017 4 juin 2004 28 déc. 2006 Sony Corporation Information server, information device, information processing system, information processing method, and informaiton processing program
US20070055390 6 sept. 2006 8 mars 2007 Homexperience Inc. Extensible universal home automation integration framework and user interface
US20070099694 31 oct. 2005 3 mai 2007 Sbc Knowledge Ventures L.P. System and method to deliver video games
US20070130254 6 févr. 2007 7 juin 2007 Russ Samuel H Apparatus for entitling and transmitting service instances to remote client devices
US20070150960 23 déc. 2003 28 juin 2007 Gilles Dubroeucq Method and system for conditional access applied to protection of content
US20070189525 14 févr. 2007 16 août 2007 Irdeto Access B.V. Method and system providing scrambled content
US20070192586 9 mars 2004 16 août 2007 Mcneely David L Secure data transmission via multichannel entitlement management and control
US20070204146 30 avr. 2007 30 août 2007 Pedlow Leo M Jr System and method for partially encrypted multimedia stream
US20070239608 23 mars 2006 11 oct. 2007 Veriplay Llc Digital media distribution system
US20070245148 3 janv. 2007 18 oct. 2007 Broadcom Corporation System and method for securing a credential via user and server verification
US20070277205 26 mai 2006 29 nov. 2007 Sbc Knowledge Ventures L.P. System and method for distributing video data
US20070291940 20 févr. 2007 20 déc. 2007 Candelore Brant L Selective encryption encoding
US20070294170 2 juin 2006 20 déc. 2007 Luc Vantalon Systems and methods for conditional access and digital rights management
US20080005030 30 juin 2006 3 janv. 2008 Scientific-Atlanta, Inc. Secure Escrow and Recovery of Media Device Content Keys
US20080137852 2 mai 2007 12 juin 2008 Rajesh Mamidwar Method and system for a transport single key change point for all package identifier channels
US20080170687 25 avr. 2006 17 juil. 2008 Koninklijke Philips Electronics, N.V. Device for and a Method of Processing an Encrypted Data Stream
US20080177998 24 janv. 2007 24 juil. 2008 Shrikant Apsangi Apparatus and methods for provisioning in a download-enabled system
US20090028327 27 juil. 2007 29 janv. 2009 Scientific-Atlanta, Inc. Secure content key distribution using multiple distinct methods
US20090048978 30 oct. 2007 19 févr. 2009 Ginter Karl L Systems and methods for secure transaction management and electronic rights protection
US20090080648 26 sept. 2007 26 mars 2009 Pinder Howard G Controlled cryptoperiod timing to reduce decoder processing load
US20090089369 3 déc. 2008 2 avr. 2009 Russ Samuel H Apparatus for Entitling and Transmitting Service Instances to Remote Client Devices
US20130332976 29 nov. 2011 12 déc. 2013 Cisco Technology Inc. Message Delivery Handling
EP0782296A2 9 déc. 1996 2 juil. 1997 Ncr International Inc. Securing transmission and receipt of electronic data
EP1014715A3 13 déc. 1999 24 juil. 2002 NEC Corporation Device for recording video signals and device for displaying electronic program guide
EP1161087A2 30 mai 2001 5 déc. 2001 Matsushita Electric Industrial Co., Ltd. Receiving apparatus that receives and accumulates broadcast contents and makes contents available according to user requests
EP1447983A1 22 janv. 2004 18 août 2004 Thomson Licensing S.A. Method of recording scrambled digital data, storage medium and method of reading such data
EP1760619A1 19 août 2005 7 mars 2007 STMmicroelectronics Ltd. System for restricting data access
FR2779599B1 Titre non disponible
GB2403586A Titre non disponible
KR20030037098A Titre non disponible
KR20040062662A Titre non disponible
WO2000011840A3 12 août 1999 29 juin 2000 Mitsubishi Electric Corp Home gateway
WO2000050978A1 3 févr. 2000 31 août 2000 General Instrument Corporation Authorization and access control of software object residing in set-top terminals
WO2000051041A8 25 févr. 2000 20 juin 2002 Accenture Llp A system, method and article of manufacture for an electronic commerce interface to the government
WO2001018807A2 16 août 2000 15 mars 2001 Koninklijke Philips Electronics N.V. Recovery of a master key from recorded published material
WO2001018807A3 16 août 2000 4 oct. 2001 Koninkl Philips Electronics Nv Recovery of a master key from recorded published material
WO2001075876A1 28 févr. 2001 11 oct. 2001 Thomson Licensing S.A. Device for reading, recording and restoring digital data in a copy-protection system for said data
WO2001082588A3 24 avr. 2001 14 mars 2002 Hughes Electronics Corp Dvr with enhanced functionality
WO2002097997A3 31 mai 2002 3 juil. 2003 Thomas Edward Cezeaux Real-time monitoring and blocking of content
WO2004023262A2 5 sept. 2003 18 mars 2004 Maxtor Corporation One button external backup
WO2004098190A1 22 oct. 2003 11 nov. 2004 Scientific-Atlanta, Inc. Networked multimedia system having a multi-room interactive network guide
WO2005029843A1 15 sept. 2004 31 mars 2005 United Video Properties, Inc. Systems and methods for exporting digital content using an interactive television application
WO2005029852A1 1 sept. 2004 31 mars 2005 Koninklijke Philips Electronics N.V. Backup and recovery of recorded contents
WO2005091626A1 22 sept. 2004 29 sept. 2005 Jung-In Choi System and method for providing personal broadcast recording channel service using extensible markup language (xml)
WO2005101411A2 12 avr. 2005 27 oct. 2005 Tivo Inc. Multicasting multimedia content distribution system
WO2006038204A1 6 oct. 2005 13 avr. 2006 Koninklijke Philips Electronics N.V. User based content key encryption for a drm system
WO2006066052A3 16 déc. 2005 26 juil. 2007 Sonic Solutions Methods and systems for use in network management of content
WO2008005699A2 22 juin 2007 10 janv. 2008 Scientific-Atlanta, Inc. Systems and methods for applying retention rules
WO2008005700A3 22 juin 2007 6 mars 2008 Scientific Atlanta Digital media device having selectable media content storage locations
WO2009015116A1 22 juil. 2008 29 janv. 2009 Scientific-Atlanta, Inc. Preventing unauthorized poaching of set top box assets
WO2009018006A1 22 juil. 2008 5 févr. 2009 Scientific-Atlanta, Inc. Secure content key distribution using multiple distinct methods
WO2009042532A2 22 sept. 2008 2 avr. 2009 Scientific-Atlanta, Inc. Controlled cryptoperiod timing to reduce decoder processing load
2 Allway Sync (Allway Sync 3.2.2), Dec. 6, 2005, pp. 1-14.
3 Australian Office Action mailed Aug. 4, 2009 in Application 2005258137.
4 Barton "TiVO-Lution: The Challenges of delivery a reliable, easy-to-use DVR service to the masses" ACM QUEUE Apr. 2006 35 more queue: www.acmqueue.com.
5 Blackcurrant, ("Delete Files Across a Network"), May 11, 2005; accessed Jul. 2, 2010 at http://techrepublic.com.com/5208-6230-0.html?forumID=3&threadID=173478&start=0; 3 pgs.
6 Boston College, "Copying Files to a USB Drive or External Hard Drive," Nov. 8, 2005, pp. 1-5 http://web.archive.org/web/20060227003853/http://www.bc.edu/offices/help/met-elements/doc/articles/html/HW-usb-drive-copy.shtml.
7 Canadian Final Action dated Jan. 16, 2015 cited in Appl. No. 2,655,531, 7 pgs.
8 Canadian Office Action dated Apr. 16, 2012 cited in Application No. 2,655,530, 3 pgs.
9 Canadian Office Action dated Aug. 24, 2011 cited in Application No. 2,655,114.
10 Canadian Office Action dated Aug. 29, 2011 cited in Application No. 2,655,530.
11 Canadian Office Action dated Aug. 3, 2012 cited in Appl. No. 2,655,677, 3 pgs.
12 Canadian Office Action dated Dec. 9, 2013 cited in Application No. 2,694,201, 2 pgs.
13 Canadian Office Action dated Dec. 9, 2014 cited in Appl. No. 2,655,677, 5 pgs.
14 Canadian Office Action dated Feb. 1, 2013 cited in Appl. No. 2,655,114, 9 pgs.
15 Canadian Office Action dated Jan. 22, 2013 cited in Appl. No. 2,655,530, 5 pgs.
16 Canadian Office Action dated Jul. 4, 2012 cited in Application No. 2,655,114, 3 pgs.
17 Canadian Office Action dated Jun. 10, 2013 cited in Application No. 2,655,531, 5 pgs.
18 Canadian Office Action dated Jun. 14, 2013 cited in Appl. No. 2,655,526, 5 pgs.
19 Canadian Office Action dated Jun. 14, 2013 cited in Application No. 2,655,536, 3 pgs.
20 Canadian Office Action dated Jun. 27, 2014 cited in Application No. 2,655,530, 2 pgs.
21 Canadian Office Action dated May 10, 2012 cited in Application No. 2,655,526, 3 pgs.
22 Canadian Office Action dated May 10, 2012 cited in Application No. 2,655,536, 3 pgs.
23 Canadian Office Action dated May 3, 2012 cited in Application No. 2,655,531, 3 pgs.
24 Canadian Office Action dated Nov. 1, 2012 cited in Application No. 2,694,201, 3 pgs.
25 Canadian Office Action dated Nov. 26, 2014 cited in Appl. No. 2,655,526, 6 pgs.
26 Canadian Office Action dated Nov. 27, 2014 cited in Appl. No. 2,694,201, 3 pgs.
27 Canadian Office Action dated Oct. 24, 2013 cited in Appl. No. 2,655,530, 6 pgs.
28 Canadian Office Action dated Sep. 2, 2011 cited in Application No. 2,652,745.
29 Canadian Office Action dated Sep. 21, 2011 cited in Application No. 2,655,531.
30 Canadian Office Action dated Sep. 21, 2011 cited in Application No. 2,655,677.
31 Canadian Office Action dated Sep. 22, 2015 cited in Application No. 2,694,201, 3 pgs.
32 Canadian Office Action dated Sep. 25, 2015 cited in Application No. 2,655,526, 3 pgs.
33 Canadian Office Action mailed Aug. 19, 2009 in Application 2,571,533.
34 Canadian Office Action mailed Feb. 2, 2011 in Application No. 2,652,745.
35 Canadian Office Action mailed Jan. 12, 2011 in Application No. 2,571,533.
36 Canadian Office Action mailed Jun. 13, 2011 cited in Application No. 2,655,526.
37 Canadian Office Action mailed Jun. 13, 2011 cited in Application No. 2,655,536.
38 Chinese First Office Action dated Feb. 29, 2012 cited in Application No. 200880108773.4, 10 pgs.
39 Chorianopoulous et al. "Affective Usability Evaluation for an Interactive Music Television Channel" ACM Computers in Entertainment, vol. 2, No. 3, Jul. 2004, Article 7b.
40 Dybwad, B.; ("TiVo 7.2 OS Adds Red Flag Content Protection Feature"), Sep. 14, 2005, pp. 1-5, http ://www.engadget.com/2005/09/14/tivo-7-2-os-adds-red-flag-content-protection-feature/.
41 Ellison, "TiVo Series 2", Jan. 13, 2004, pp. 1-6, http://www.pcmag.com/article2/8,2817,1649659,00.asp.
42 EP Communication dated May 6, 2010 in Application No. 08 833 391.9-1244.
43 Eskicioglu et al. "An overview of multimedia content protection in consumer electronics devices," Signal Processing. Image Communication, Elsevier Science Publishers, Ambsterdam, NL, vol. 16, No. 7, Apr. 2001, pp. 681-699, XP004232133 ISSN: 0923-5965.
44 European Decision to Refuse dated Jul. 26, 2011 cited in Application No. 07 815 092.7-1245.
45 European Decision to Refuse dated Oct. 7, 2013 cited in Appl. No. 11 169 374.3, 13 pgs.
46 European Office Action dated Apr. 21, 2011 in Application No. 07 798 909.3.
47 European Office Action dated Apr. 4, 2011 in Application No. 07 815 092.7.
48 European Office Action dated Jan. 18, 2012 cited in Appl. No. 07 781 952.2, 5 pgs.
49 European Office Action dated Nov. 14, 2012 cited in Application No. 08 782 173.2, 6 pgs.
50 European Office Action dated Oct. 11, 2013 cited in Appl. No. 07 781 952.2, 4 pgs.
51 European Office Action mailed Apr. 29, 2009 in Application No. 07 784 510.5.
52 European Office Action mailed Apr. 29, 2009 in Application No. 07 798 908.5.
53 European Office Action mailed Feb. 10, 2009, in Application No. 07798909.3.
54 European Office Action mailed Feb. 11, 2009, in Application No. 07798908.5.
55 European Office Action mailed Feb. 18, 2009, in Application No. 07 798 909.3.
56 European Office Action mailed Jul. 24, 2008 in Application No. 03 755 496.1.
57 European Office Action mailed Jun. 9, 2009 in Application No. 07 815 092.7.
58 European Office Action mailed Mar. 16, 2009, in Application No. 07 781 952.2.
59 European Office Action mailed May 11, 2009 in Application No. 05 766 482.3.
60 European Office Action mailed May 7, 2009 in Application No. 07 840 308.6.
61 European Office Action mailed Sep. 9, 2010 in Application No. 07 840 308.6.
62 European Office Communication dated Oct. 16, 2012 cited in Appl. No. 11 169 374.3, 7 pgs.
63 European Office Communication dated Oct. 5, 2012 cited in Appl. No. 07 798 910.1, 7 pgs.
64 European Summons to Attend Oral Proceedings dated Aug. 1, 2012 cited in Appl. No. 07840308.6, 7 pgs.
65 European Summons to Attend Oral Proceedings dated Jun. 26, 2014 cited in Application No. 07798910.1, 6 pgs.
66 European Summons to Attend Oral Proceedings dated May 14, 2013 cited in Application No. 11169374.3, 8 pgs.
67 Extended European Search Report dated Dec. 22, 2011 cited in Application No. 11169374.3, 9 pgs.
68 Gilo: "Do It Yourself Making an External Hard Drive Guide" Notebookreview.com, [online], Jun. 2, 2006, XP002459852, Retrieved from the internet: URL:http://www.notebookreview.com/default.asp?newsID=2972 [retrieved on Nov. 22, 2007].
69 Haughey, M.; ("PC to TiVo Playback Released"), Oct. 24, 2005, pp. 1-13 http://web.archive.org/web/20051024002825/http://www.pvrblog.com/pvr/2005/08/pc-to-tivo-play.html.
70 Haughey, M.; ("TiVo 7.2 OS Adds Content Protection, Blocks Transfers, and Auto-Deletes Some Shows"), Sep. 13, 2005, pp. 1-14, http://www.pvrblog.com/pvr/2005/09/tivo-72-os-adds.html.
71 International Preliminary Report mailed Jan. 6, 2009, in PCT/US2007/072328.
72 International Preliminary Report on Patentability dated Mar. 30, 2010 in PCT/US2008/077157.
73 International Search Report and Written Opinion dated Dec. 21, 2007, cited in PCT/US2007/071842.
74 International Search Report and Written Opinion dated Jun. 7, 2006, cited in PCT/US2005/022069.
75 International Search Report and Written Opinion dated Mar. 10, 2008, cited in PCT/US2007/071841.
76 International Search Report and Written Opinion mailed Sep. 16, 2008 in PCT/US2008/070707.
77 International Search Report cited in PCT/US2007/071843 mailed Dec. 27, 2007.
78 International Search Report dated Apr. 28, 2009 in PCT/US2008/077157.
79 International Search Report dated Dec. 12, 2008 in PCT/US2008/070690.
80 International Search Report dated Jan. 31, 2008, in PCT/US2007/070680.
81 International Search Report dated Oct. 22, 2003 in PCT/US2003/016585.
82 iPod shuffle User's Guide (Apple Computer, Inc.) 2005 (http://manuals.info.apple.com/en-US/iPodshuffleUserGuide.pdf), 32 pgs.
83 Korean Notice of Final Rejection dated Jul. 28, 2011 cited in Application No. 10-2008-7030549.
84 Menezes, et al.; "Handbook of Applied Cryptography" Handbook of applied Cryptography, CRC Press Series on Discrete Mathematics and Its Applications, Boca Raton, FL CRC Press, 1997, pp. 546, 567-570, XP002356116 ISBN: 0-8493-8523-7.
85 Notice of Final Rejection dated Nov. 26, 2010 cited in Korean Application No. 10-2008-7031848.
86 Notice of Preliminary Rejection dated May 28, 2010, cited in KR Appl. No. 10-2008-7031848, 7 pgs.
87 Notice of Preliminary Rejection dated Oct. 25, 2010 cited in Korean Application No. 10-2008-7030549.
88 Notice of Preliminary Rejection dated Sep. 18, 2010 cited in Korean Application No. 10-2008-7032127.
89 Office Action mailed Apr. 1, 2010, in U.S. Appl. No. 11/405,205.
90 Office Action mailed Apr. 14, 2010, in U.S. Appl. No. 11/428,367.
91 Office Action mailed Apr. 2, 2009, in U.S. Appl. No. 11/428,357.
92 Office Action mailed Apr. 30, 2008, in U.S. Appl. No. 11/482,356.
93 Office Action mailed Aug. 20, 2007, in U.S. Appl. No. 10/873,805.
94 Office Action mailed Aug. 31, 2010 in U.S. Appl. No. 11/405,205.
95 Office Action mailed Aug. 4, 2009, in U.S. Appl. No. 11/428,356.
96 Office Action mailed Aug. 5, 2008, in U.S. Appl. No. 11/428,357.
97 Office Action mailed Aug. 7, 2009, in U.S. Appl. No. 11/428,362.
98 Office Action mailed Dec. 12, 2008, in U.S. Appl. No. 11/428,365.
99 Office Action mailed Dec. 17, 2008, in U.S. Appl. No. 10/873,805.
100 Office Action mailed Dec. 9, 2009, in U.S. Appl. No. 11/428,357.
101 Office Action mailed Feb. 1, 2010, in U.S. Appl. No. 11/428,356.
102 Office Action mailed Feb. 24, 2010, in U.S. Appl. No. 12/327,157.
103 Office Action mailed Jan. 14, 2010, in U.S. Appl. No. 11/428,362.
104 Office Action mailed Jan. 9, 2008, in U.S. Appl. No. 10/873,805.
105 Office Action mailed Jul. 22, 2009, in U.S. Appl. No. 11/428,357.
106 Office Action mailed Jul. 9, 2008, in U.S. Appl. No. 10/873,805.
107 Office Action mailed Mar. 18, 2009, in U.S. Appl. No. 11/428,362.
108 Office Action mailed May 11, 2010, in U.S. Appl. No. 11/428,357.
109 Office Action mailed May 26, 2010, in U.S. Appl. No. 11/428,362.
110 Office Action mailed May 28, 2009, in U.S. Appl. No. 11/428,365.
111 Office Action mailed May 5, 2010, in U.S. Appl. No. 11/428,365.
112 Office Action mailed Nov. 2, 2010 in U.S. Appl. No. 11/428,362.
113 Office Action mailed Nov. 28, 2008, in U.S. Appl. No. 11/482,356.
114 Office Action mailed Oct. 14, 2010 in U.S. Appl. No. 11/428,365.
115 Office Action mailed Oct. 26, 2009, in U.S. Appl. No. 11/428,365.
116 Office Action mailed Oct. 26, 2010 in U.S. Appl. No. 11/428,357.
117 Office Action mailed Oct. 28, 2009, in U.S. Appl. No. 11/942,778.
118 Office Action mailed Oct. 7, 2009, in U.S. Appl. No. 11/428,367.
119 Office Action mailed Sep. 22, 2009, in U.S. Appl. No. 11/454,421.
120 Office Action mailed Sep. 30, 2008, in U.S. Appl. No. 11/428,362.
121 Old Apps, ("Old Version of WinSCP"), Jan. 13, 2003, pp. 1-3; accessed Jul. 2, 2010 at http://www.oldapps.com/WinSCP.php?old-winscp=2; 3 pgs.
122 Picker, "The Digital Video Recorder: Unbundling Advertising and Content" Professor of Commercial Law, The University of Chicago Law School, Senior Fellow, The Computation Institute of the University of Chicago and Argonne National Laboratory; Sep. 10, 2003.
123 Smith, J.; "Files and Folders: Removable Media," Oct. 13, 2004, pp. 1-12 http://web.archive.org/web/20041027194919/http://www.jegsworks.com/Lessons/win/filesandfolders/step-removabledisk.htm.
124 Supplemental European Search Report dated Jan. 24, 2008, in Application No. 03 755 496.01.
125 The iTunes application, 18 pgs. (http://en.wikipedia.org/wiki/iTunes-Store) introduced to the public on Apr. 28, 2003.
126 The Norton Commander running under the DOS and Windows operating systems officially produced between 1986 and 1998, 4 pgs. (http://en.wikipedia.org/wiki/Norton-Commander).
127 The Windows File Manager released between 1990 and 1999, 3 pgs. (http://en.wikipedia.org/wiki/File-Manager-(Windows)).
128 TiVo.com "What is TiVo?", Jan. 14, 2005, pp. 1-12; http://web.archive.org/web/20050114053806/http://www.tivo.com/1.0.asp.
129 U.S. Appl. No. 09/111,958, filed Jul. 8, 1998, entitled "Mechanism and Apparatus for Encapsulation of Entitlement Authorization in Conditional Access System," Inventor: Defreese et al.
130 U.S. Appl. No. 10/873,805, filed Jun. 22, 2004, Entitled "Validating Client Receivers," Inventors: Pinder et al.
131 U.S. Appl. No. 10/920,841, filed Aug. 18, 2004, Entitled "Retrieval and Transfer of Encrypted Hard Drive Content from Digital Video Receiver Set Top Box Utilizing Second Digital Video Receiver Set Top Box," Inventor: Wasilewski, Anthony.
132 U.S. Appl. No. 10/920,842, filed Aug. 18, 2004, Entitled "Utilization of Encrypted Hard Drive Content by One Digital Video Receiver Set Top Box when Recorded by Another," Inventor: Wasilewski, Anthony.
133 U.S. Appl. No. 10/920,926, filed Aug. 18, 2004, Entitled "Retrieval and Transfer of Encrypted Hard Drive Content from Digital Video Receiver Set Top Box," Inventor: Wasilewski, Anthony.
134 U.S. Appl. No. 11/405,205, filed Apr. 17, 2006, Entitled "System and Method for Prioritizing the Storage Location of Media Data," Inventors: Prus et al.
135 U.S. Appl. No. 11/428,356, filed Jun. 30, 2006, Entitled "System and Method for Applying Retention Rules," Inventors: Prus et al.
136 U.S. Appl. No. 11/428,357, filed Jun. 30, 2006, Entitled "Digital Media Device having Selectable Media Content Storage Locations," Inventors: Prus et al.
137 U.S. Appl. No. 11/428,362, filed Jun. 30, 2006, Entitled "System and Method for Managing Media Data," Inventors: Prus et al.
138 U.S. Appl. No. 11/428,365, filed Jun. 30, 2006, Entitled "Digital Media Device having Media Content Transfer Capability," Inventors: Russ et al.
139 U.S. Appl. No. 11/428,367, filed Jun. 30, 2006, Entitled "Secure Escrow and Recovery of Media Device Content Keys," Inventors: Schlarb et al.
140 U.S. Appl. No. 11/671,506, filed Feb. 6, 2007, Entitled "Apparatus for Entitling and Transmitting Service Instances to Remote Client Devices," Inventors: Russ et al.
141 U.S. Appl. No. 11/942,778, filed Nov. 20, 2007, Entitled "Retrieval and Transfer of Encrypted Hard Drive Content from Digital Video Receiver Set Top Box to a Content Transcription Device," Inventor: Wasilewski, Anthony.
142 U.S. Final Office Action dated Dec. 15, 2014 cited in U.S. Appl. No. 11/428,367, 21 pgs.
143 U.S. Office Action dated Jun. 12, 2014 cited in U.S. Appl. No. 11/428,367, 54 pgs.
144 U.S. Office Action dated Oct. 19, 2011 cited in U.S. Appl. No. 11/405,205.
145 U.S. Official Action mailed Apr. 21, 2011 in U.S. Appl. No. 11/781,412.
146 U.S. Official Action mailed Aug. 16, 2010 in U.S. Appl. No. 11/829,647.
147 U.S. Official Action mailed Aug. 31, 2010 in U.S. Appl. No. 11/861,328.
148 U.S. Official Action mailed Dec. 8, 2010 in U.S. Appl. No. 11/781,412.
149 U.S. Official Action mailed Feb. 2, 2011 in U.S. Appl. No. 11/829,647.
150 U.S. Official Action mailed Jun. 17, 2010 in U.S. Appl. No. 11/781,412.
151 WinFtp, Sep. 8, 2005, pp. 1-7 http://download.cnet.com/WinFtp-Client/3000-2160-4-10429297.html.
152 Written Opinion dated Dec. 12, 2008 in PCT/US2008/070690.
153 Wurmlin et al. "3D Video Record" Proceedings of the 10th Pacific Conference on Computer Graphics and Applications (PG'02) IEEE Computer Society.
Classification internationale H04N7/167, H04N21/4405, H04N21/4623, H04N21/8355, H04N21/254, H04N21/4788, H04N21/4627, G06F21/10, H04N21/433, H04N21/4408, G06F21/00, H04N21/835
Classification coopérative H04N21/4627, H04N21/63345, H04N21/8355, H04N21/835, H04N7/1675, H04N21/4408, H04N21/4623, H04N21/4788, H04N21/2541, H04N21/4405, G06F21/10, H04N21/4331
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PINDER, HOWARD;MAHOLSKI, ANDREW;REEL/FRAME:018009/0194;SIGNING DATES FROM 20060614 TO 20060615
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PINDER, HOWARD;MAHOLSKI, ANDREW;SIGNING DATES FROM 20060614 TO 20060615;REEL/FRAME:018009/0194