Abstract: A method and system for forming a data table in memory on an end user system. The data table forming a library index of storage locations to electronic digital content in memory. The method consists of retrieving an encrypted file from storage. The file has a beginning, an end and a trailer section located just prior to the end. The file is read from the end a predetermined distance to verify if an identifier is present. Reading and decrypting the trailer section from the file read. Determining if there are any updates in the trailer section. In the case there are no updates in the trailer section then decrypting the reference table containing one or more data table location indicators for data items with the first decrypting key. Next, decrypting one or data items with the first decrypting key. Populating the data table with data items at locations specified in the reference table.

Abstract: A high-speed dubbing unit 10 for dubbing digital data from an optical disk 15 to a hard disk 16 at a high speed is connected via a public telephone line to a payment imposing unit 20. A control unit 13 is provided for generating in its basic data generator 13B basic data for imposing the payment from at least data indicative of the user identification and data indicative of the speed for recording the data read out from the optical disk 15 into the hard disk 16 and transmitting the basic data to the payment imposing unit 20. The payment imposing unit 20 performs the imposing of the payment according to the basic data received from the control unit 13 and transmits data indicative of the completion of imposing the payment to the control unit 13. In response to the data indicative of the completion of the payment, the control unit 13 directs the high-speed dubbing unit 10 to start recording the data read out from the optical disk 15 into the hard disk 16.

Abstract: The invention relates to a method for decrypting encrypted data stored on a record carrier, to a corresponding method for encrypting data and to corresponding apparatuses. In order to provide a high level of protection for data stored on a record carrier and to prevent that data stored on different record carriers can be decrypted after a decryption algorithm has become known the method for decrypting encrypted data according to the invention comprises the following steps: a) generating a decryption key (DK) using a unique carrier identifier (UDI) associated with said record carrier, a hidden key (HK) stored in a hidden channel on said record carrier and a password key (PK), and b) decrypting said encrypted data stored on said record carrier using said generated decryption key (DK).

Abstract: A method, apparatus, and article of manufacture provide the ability to securely distribute digital media content from a first entity to a second entity through an intermediate entity. A studio token, comprising information utilized to generate a first key, is generated and distributed to the first entity. A theater token, comprising information utilized to generate a second key, is also generated and then distributed to the second entity. A data file is accepted from the first entity. The data file comprises the media content encrypted according to the first key generated from the studio token, and an authorization header that provides information utilized to generate the second key. The data file is further encrypted according to a third key wherein such further encryption comprises adding a new header to the encrypted media content. The encrypted data file is then distributed to the second entity.

Abstract: The invention is a secure server, or trust engine, having server-centric keys, or in other words, storing cryptographic keys and user authentication data on a server. Users access cryptographic functionality through network access to the trust engine; however, the trust engine does not release actual cryptographic keys or other authentication data. Therefore, the system provides that the keys and data remain secure. The server-centric storage of keys and authentication data provides for user-independent security, portability, availability, and straightforwardness, along with a wide variety of implementation possibilities.

Abstract: The invention relates to a process of validation for transactions between a user terminal and a server of the type involving: “Request, Challenge, Response, Verification and Approval”. In other aspects it also relates to a computer network, server or terminal for performing the method, as well as a physical key. It involves providing a code word made up of a first series of elements to a user. Providing a key to the user to use to scramble the code word. Holding the code word and key securely at the server; Receiving a request communication at the server from a user terminal. Responding to the request by issuing a second series of elements from the server to the user terminal. Displaying the second series of elements at the terminal. Inviting the user to enter a scrambled version of the code word by selecting the elements of the first series in order from the second series and for each element selected making an entry at the terminal in dependence on the key to create a series of entries.

Abstract: An image processing apparatus capable of preventing a copy protect function of a video or other contents signal from being disabled. An encoder encodes a contents signal from a DVD reproduction unit. A copy protect circuit performs copy protect processing on the encoded signal and outputs it. The copy protect circuit is controlled by control data input from CPU via an I2C_IF circuit. At this time, verification data from the CPU is stored in, and then read from registers in the I2C_IF circuit. Then, the CPU verifies the destination of transmission of the control data.

Abstract: A system and method for automatically protecting private video content using embedded cryptographic security is disclosed. A substantially continuous video signal representing raw video content is divided into individual frames. Each frame stores a fixed amount of data in digital form. Each individual frame is encrypted into encrypted video content using an encryption cryptographic key. The encrypted frames is stored on a transportable storage medium. Encrypted frames are retrieved from the transportable storage medium. A decryption cryptographic key is verified prior to decryption. Each encrypted frame is decrypted using the decryption cryptographic key. The decrypted frames are combined into a substantially continuous video signal representing the raw video content in reconstructed form. In a further embodiment, private video content automatically authenticated using embedded cryptographic security, either alone or in conjunction with the encryption of video content.

Abstract: A security unit to prevent unauthorized retrieval of data includes an encrypting unit for encrypting data in accordance with commands received by the security unit, and a common register for storing both intermediate results and final results of the data encryption. A switching element operatively coupled to the register selectively outputs the contents of the register. The switching element is controlled to prevent external access to the intermediate results of the encryption. The security unit is particularly useful as part of a memory unit that is attachable to a recording/reproduction device such as a digital audio recorder/player.

Abstract: A data player for reading contents encrypted by a decoding key from a digital medium, and playing the encrypted contents by using the decoding key which is stored in a key storage unit, comprises: a key obtaining unit for performing mutual authentication with the key storage unit to obtain the decoding key stored in the key storage unit; a key holding unit for holding the decoding key; a playback state obtaining unit for monitoring the playback state of the digital medium; and a contents decoding unit for decoding the encrypted contents by using the decoding key. The decoding key is obtained by the key obtaining unit and stored in the key holding unit, and the encrypted contents read from the digital medium is decoded with the decoding key by the contents decoding unit to play the contents. The decoding key stored in the key holding unit is discarded according to the playback state of the digital medium which is obtained by the playback state obtaining unit.

Abstract: A system for providing scrambled content, comprising a control word generator, each control word including a control word identifier, a scrambler for providing a stream of scrambled data packets, and an encryption device for providing entitlement control messages (ECM's). One or more consecutive packets are scrambled using the same control word (CW). Each packet includes a control word identifier identifying the control word used. The ECM encryption device provides ECM's including a previous control word (CWP), a current control word (CWC) and a next control word (CWN). A system for descrambling scrambled content comprises a descrambler for descrambling the scrambled content and a decryption device for decrypting ECM's to obtain control words.

Abstract: An object of the invention is to provide a transmitting system of which data is difficult to be tapped and which is suitable for flexibly determining a watching and listening fee. In order to achieve the object, there is provided a combination of a transmitting method comprising steps of, transmitting encoded data which has been encoded, to a receiving side, changing the encoding in a predetermined unit, and performing recording according to requirement, from the receiving side of information concerning decoding of the encoded data, and a receiving method comprising steps of, receiving the encoded data which has been encoded, from a transmitting side, requiring the information concerning the decoding of the encoded data, to the transmitting side, and decoding the encoded data by using the obtained information concerning the decoding.

Abstract: A secure electronic content system and method is provided. The system includes a controller including an interface component, a host system coupled to the controller, the host system configured to present content under predetermined conditions, the host system operable with a navigation protocol, the host system further including a system manager operable with an associations component configured to be at least partially run by the host system, a translator configured to provide meanings and generate commands within the host system at least a first digital rights management (DRM) component configured to provide encoding and access rules for the content; and a file system component including a file system application programming interface (API) configured to provide a logical interface between a plurality of components.

Abstract: Content data encrypted with a content key, the content key encrypted with an individual key specific to an information sending device, and the individual key encrypted with a distribution key that is updated in a predetermined cycle, and supplied are sent to an information receiving device, and the information receiving device decrypts the individual key with the distribution key, decrypts the content key with the individual key, and decrypts the content data with the content key. Thus, the information sending device does not have the distribution key, and accordingly piracy of content data can be prevented with a simple configuration. Also, the information receiving device sends the content key and a playback command to other apparatuses. Thus, other apparatuses can play back contents using the playback command and the content key. Furthermore, the information sending device decrypts the content key with the distribution key before being updated, and stores the same.

Abstract: The method of preventing illegal copy of contents encrypts a header using a key generated from the previous sector, performs variable-length coding to the encrypted header to shorten its length, and stores the decoded header into the recording medium as well as contents data, in encryption phase. The method, in decryption phase, reproduces the contents data which have different length for each sector by decoding and encoding the header.

Abstract: Media content is associated with households using smart cards. The media content is encrypted and/or decrypted based on a household identifier corresponding to a smart card. Media content is encrypted such that it can only be decrypted with the same (or similar) smart card. Thus, the encrypted media content can be safely transferred within a computing device, stored, transferred to other computing devices, etc. because it cannot be decrypted without the smart card.

Abstract: MAC values formed with respect to each file belonging to a directory 122A and ICVs (D-ICVc) formed on the basis of the MAC values of all files belonging to the directory 122A are stored into a sequence page 121A. Sequence pages 121A, 121B, . . . formed respectively with respect to all of directories 122A, 122B, . . . on a disk and the ICVs formed on the basis of the D-ICVs stored in all of the sequence pages 121A, 121B, . . . are stored into a sequence block 114. Since the MAC values are closed and managed every directory by the sequence pages 121A, 121B, . . . , a data alteration check can be executed every directory. An alteration check of data recorded on a recording medium can be efficiently performed.

Abstract: A flexible product distribution and payment system for computer network based electronic commerce is disclosed. Primary content data is made available to customers through a detachable local storage medium, such as a DVD or CD-ROM disc, or over a network connection. The primary content is capable of being accessed and played back through a computer or game console at the customer site. The primary content distribution may comprise a superset of content that is intended to be used by the customer. The customer is allowed to view and access the encoded primary content, and is charged only for the primary content that is used. Content that is encoded on the medium but that is not used by the customer remains on the medium but is not charged. A content database and customer database maintained at the primary customer site maintain records of products ordered and used by the customer, as well as identification and use patterns associated with the user.

Abstract: Fee imposition system and method for application software, in which a software providing corporation can collect the fee without fail and charge a fair fee to a customer, and thereby the customer can use the application software with a paying method easy to estimate. The fee imposition system includes a server machine installed in a management center for managing the software, a client machine installed in a customer's office and connected with the server machine through a communication means, a ticket issue unit for issuing a ticket file on the basis of a predetermined fee schedule, and a data copy/writing unit for copying data corresponding to the information designated by the ticket file from a data source memory unit and recording the copied data on a data target memory unit.

Abstract: In the chaining key broadcasting reception system, a chaining key reception unit receives a chaining key, an identifier of the key in question and a target key identifier indicative of a chaining key to be decoded by the key in question; a chaining key management unit takes out an already stored chaining key by using the target key identifier received by the chaining key reception unit; and a chaining key decoding unit decodes the chaining key received by the chaining key reception unit by using the chaining key sent from the chaining key management unit to generate a new chaining key.

Abstract: A system and method for delivering digital media content to a user over a network is disclosed. The illustrative embodiment of the present invention enables multiple types of electronic devices to access the same digital media content for the same end user through the use of a smart card equipped with a license for the digital media content. Depending on the format of the digital media content, devices such as phones, pagers, internet appliances or PDAs can be used to present the digital media content to a user, as can traditional consumer electronic devices such as DVD players and VCRs. The encrypted content may be freely transferred and stored without copyright concerns since the decryption key is generated by the smart card containing the license.

Abstract: A conditional access system and method are disclosed allowing the use of a standard smart card. A computing resource configured to run the conditional access protocol has a smart card interface and a software wrapper configured to run on the computing resource coupling the smart card interface to the conditional access protocol.

Abstract: An information signal is transmitted. The information signal contains 1) encryption-resultant information, 2) an error correction code signal, and 3) decrypting information. The error correction code signal is designed for correction of at least one error in the encryption-resultant information. The error correction code signal is repetitively completed at a completion period. The decrypting information is designed for decryption of the encryption-resultant information. The decrypting information is repetitively completed piece by piece. At least one compete piece of the decrypting information is dispersively placed in a portion of the information signal which corresponds to the completion period of the error correction code signal.

Abstract: MAC values formed with respect to each file belonging to a directory 122A and ICVs (D-ICVc) formed on the basis of the MAC values of all files belonging to the directory 122A are stored into a sequence page 121A. Sequence pages 121A, 121B, . . . formed respectively with respect to all of directories 122A, 122B, . . . on a disk and the ICVs formed on the basis of the D-ICVs stored in all of the sequence pages 121A, 121B, . . . are stored into a sequence block 114. Since the MAC values are closed and managed every directory by the sequence pages 121A, 121B, . . . , a data alteration check can be executed every directory. An alteration check of data recorded on a recording medium can be efficiently performed.

Abstract: A method and system for creating a new digital work from one or more existing digital works having parts. A first part of a digital work has first usage rights associated therewith, the first usage rights specifying a particular manner of use for the first part. A second part of a digital work has second usage rights associated therewith, the second usage rights specifying a particular manner of use for the second part. A new digital work is created by combining the first part and the second part as new content and associating new usage rights with the new content. The new usage rights specify a particular manner of use for the new digital work.

Abstract: A network transaction system applicable to cyberspace banking services using an open network, which allows customers to authenticate themselves through a simplified procedure. A customer's terminal station and a plurality of bank systems are interconnected via networks, and it is assumed that the customer wishes to newly open a bank account in a bank system among them, or a target bank system, and that the customer has an existing bank account in a different bank system, or an cooperative bank system. Using his/her terminal station, the customer applies for a new bank account by supplying the target bank system with a ciphertext message containing existing account information descriptive of the customer's bank account in the cooperative bank system. The target bank system requests the cooperative bank system to confirm the customer's existing bank account, while forwarding thereto a part of the ciphertext message containing the existing account information.

Abstract: An audio playback/recording apparatus includes an audio input processing section which receives analog audio data, and converts the analog audio data to digital audio data; a playback/recording processing section which compresses digital audio data output from the audio input processing section and stores the compressed digital audio data into a RAM and which decompresses the compressed digital audio data according to attribution data indicating a type of compression; an audio output processing section which receives the decompressed digital audio data, converts the decompressed digital audio data to analog audio data, and outputs the analog audio data to an output apparatus; and an external recording circuit section which records compressed digital audio data stored in the RAM into an external recording medium, reads out the compressed digital audio data, and stores the data into the RAM.

Abstract: An electronic-monetary system having (1) banks or financial institutions that are coupled to a money generator device for generating and issuing to subscribing customers electronic money including electronic currency backed by demand deposits and electronic credit authorizations; (2) correspondent banks that accept and distribute the electronic money; (3) a plurality of transaction devices that are used by subscribers for storing electronic money, for performing money transactions with the on-line systems of the participating banks or for exchanging electronic money with other like transaction devices in off-line transactions; (4) teller devices, associated with the issuing and correspondent banks, for process handling and interfacing the transaction devices to the issuing and correspondent banks, and for interfacing between the issuing and correspondent banks themselves; (5) a clearing bank for balancing the electronic money accounts of the different issuing banks; (6) a data communications network for provi

Abstract: A disk-shaped recording medium includes a transparent substrate, and an optical recording layer formed on the transparent substrate. A light source emits light. An optical head is operative for applying the light to the optical recording layer from the light source via the transparent substrate, for focusing the light on the optical recording layer, and for reproducing information from the optical recording layer. A position detecting device is operative for detecting at least one of a pit depth and a physical position of information which has a first given relation with a specified address and which is recorded on the recording medium, and for generating first positional information representing at least one of the pit depth and the physical position. A previously-recorded secret code is reproduced from the recording medium. The secret code represents second positional information. The secret code is decoded into the second positional information.

Abstract: The present invention permits a user to conduct remote transactions without a network while using an untrusted computing device, such as a hand-held personal digital assistant or a laptop computer. The computing device is augmented with a smartcard reader, and the user obtains a smartcard and connects it to the device. This design can be used by an untrusted user to perform financial transactions, such as placing bets on the outcome of a probabilistic computation. Protocols are presented for adding (purchasing) or removing (selling) value on the smartcard, again without requiring a network connection. Using the instant protocols, neither the user nor the entity issuing the smartcards can benefit from cheating.

Abstract: A system and method for enabling broadcast programs to be copied once only by consumer recorders includes writing a unique media identification on each blank disk to which content is to copied in a read-only area of the disk before it is initially recorded. Also, a one-way key management media key block is written to the disk. A content key is derived by combining a media key, derived from the media key block, with the media identification. Additionally, to facilitate copying the content one time only, an exchange key is established between the recorder and a sender such as a satellite receiver or a disk player that is associated with the recorder, and the exchange key is modified with special numbers representing control commands including copy once and copy no more. The exchange key is then encrypted using the content key and then hashed with a nonce to render a bus content key. The bus content key is then used to encrypt the data for copying the data to a disk.

Abstract: One embodiment of the present invention provides a system that uses digital signatures in a novel configuration to perform validations to facilitate a trade. This system operates by receiving a quote related to the trade at a first computer system, wherein the quote includes permission information that facilitates determining permissions that have been granted to a quote maker. Upon receiving the quote, the system validates that the quote maker digitally signed the quote by using a public key of the quote maker to verify that the quote was signed by a corresponding private key belonging to the quote maker. The system also validates that the quote maker has permission to perform the trade by using a public key of a first security officer to verify that the permission information was signed by a corresponding private key belonging to the first security officer, thereby authorizing the quote maker to perform the trade.

Abstract: A personalized smart card stores therein public and private cryptography keys stored which are used to securely request and receive subscriber content data from a service provider, utilizing a remote control device.

Abstract: A switching portion of an IRD supplies a non-descrambled TS (transport stream) received from a front end portion or a descrambled TS received from a descrambler to a DVCR connected to an IEEE 1394 interface. In addition, data received from the DVCR is supplied to the descrambler.

Abstract: To prevent piracy or leakage of data content, a cryptography technique and electronic watermark technique are combined together and used. In a data content supplied to a user, a user data is entered as electronic watermark by a data management center, and the data content with an electronic watermark entered in it is encrypted using a crypt key and is supplied. The encrypted data content is decrypted using a crypt key distributed from the data management center and is used. In case it is to be stored, it is encrypted using another crypt key. In case the data content is copied and transferred to other user, a user data of the other user is entered as electronic watermark, and a scenario to enter the user data of the other user as electronic watermark is registered at the data management center, and the data content with electronic watermark entered in it is encrypted using another crypt key and is supplied.

Abstract: A system for controlling the distribution and use of digital works using digital tickets. In the present invention, a “digital ticket” is used to entitle the ticket holder to exercise some usage right with respect to a digital work. Usage rights are used to define how a digital work may be used or distributed. Each usage right may specify a digital ticket which must be present before the right may be exercised. Digital works are stored in repositories which enforce a digital works usage rights. Each repository has a “generic ticket agent” which punches tickets. In some instances only the generic ticket agent is necessary. In other instances, punching by a “special ticket agent” residing on another repository may be needed.

Abstract: The descrambling device comprises hardware resources (1) and first memory zones (CA1, CA2, . . . , CAn) to store at least two different access control codes for controlling the hardware resources. The device also contains an arbitration code for selecting one access control code to control the hardware resources in order to share access to the hardware resources from the access control codes. Access control codes can be downloaded in the first memory zones by means of a loader contained in the device.

Abstract: A digital recording/reproducing system includes a set top box. The STB receives a digital television broadcast signal and transmits a scrambled data stream from a stream selector via an interface to a digital recording/reproducing apparatus. In the data recording/reproducing apparatus, a scramble key is acquired depending on a billing request for data recording. To AS-MO disc are recorded a contents key converted from a disc unique ID using a descramble key as well as the data stream. In accordance with a user's approval for the billing, an account table is created which is registered in an IC card and transmitted via a MODEM and telephone line.

Abstract: A disk-shaped recording medium includes a transplant substrate, and an optical recording layer formed on the transparent substrate. A light source emits light. An optical head is operative for applying the light to the optical recording layer from the light source via the transparent substrate, for focusing the light on the optical recording layer, and for reproducing information from the optical recording layer. A position detecting device is operative for detecting at least one of a pit depth and a physical position of information which has a first given relation with a specified address and which is recorded on the recording medium, and for generating first positional information representing at least one of the pit depth and the physical position. A previously-recorded secret code is reproduced from the recording medium. The secret code represents second positional information. The secret code is decoded into the second positional information.

Abstract: A conditional access broadcast system for realizing conditional access while maintaining the safety level is disclosed. A contract management device at a broadcast station side delivers a reception contract information containing at least a contract information for controlling decryption of encrypted contents information delivered from a broadcast station by broadcast and a reception device ID in correspondence, which is encrypted using a master key which is commonly provided with respect to all the broadcast reception devices. At each broadcast reception device, whether or not to give a channel key for decrypting the encrypted contents information to the decryption unit is controlled according to the contract information for own broadcast reception device which is acquired from the encrypted reception contract information.

Abstract: Before use, a population of tamper-resistant cryptographic enforcement devices is partitioned into groups and issued one or more group keys. Each tamper-resistant device contains multiple computational units to control access to digital content. One of the computational units within each tamper-resistant device communicates with another of the computational units acting as an interface control processor, and serves to protect the contents of a nonvolatile memory from unauthorized access or modification by other portions of the tamper-resistant device, while performing cryptographic computations using the memory contents. Content providers enforce viewing privileges by transmitting encrypted rights keys to a large number of recipient devices. These recipient devices process received messages using the protected processing environment and memory space of the secure unit.

Abstract: The present method permits a user to conduct remote transactions without a network while using an untrusted computing device, such as a hand-held personal digital assistant or a laptop computer. The computing device is augmented with a smartcard reader, and the user obtains a smartcard and connects it to the device. This design can be used by an untrusted user to perform financial transactions, such as placing bets on the outcome of a probabilistic computation. Protocols are presented for adding (purchasing) or removing (selling) value on the smartcard, again without requiring a network connection. Using the instant protocols, neither the user nor the entity issuing the smartcards can benefit from cheating.

Abstract: A system and method for distribution of electronic content over a network infrastructure and compensation of vendors of such data using prepaid media that includes a client device for operation by a user desiring to receive the electronic content and server that contains the electronic content and offering the electronic content for downloading to the client device via the network infrastructure. The client device communicates a unique identifier associated with a particular piece of media to which the electronic content is to be stored to the server. The server contacts a media tracking sever to determine if the media is valid and a remaining balance of the prepaid media. The cost of the electronic content to be downloaded is deducted from the remaining balance and credited to the vendor's account.

Abstract: A data delivery system has a capability of effectively and reliably protecting copyright of the data. A video source of a movie or the like is delivered in the form of encrypted data from a server apparatus to a playback apparatus. A decryption key used to decrypt the encrypted data is stored on a storage medium such as a memory card, and the storage medium is sent from the server apparatus to the playback apparatus in parallel with the delivery of the encrypted data. After completion of the playing of the movie by the playback apparatus in a movie theater, the storage medium is returned to the server apparatus. The server apparatus examines information stored on the storage medium to check whether the video source delivered in the form of data has been properly used in an authorized manner.

Abstract: Method and system for issuing and using anonymous and pseudonymous prepaid payment cards through the existing credit card and debit card infrastructure.

Abstract: A copy prevention method and apparatus for a digital video system is disclosed including the steps of: (a) adding a header area of a header start code and key field to a reproduced bit stream: (b) decrypting and transmitting the bit stream to which the header area is added: (c) detecting a key field of the decrypted and transmitted bit stream and detecting copy prevention information; and (d) encrypting the bit stream according to information detected from stop (c) and recording it an tape.

Abstract: A secure cryptographic rights unit for cryptographically regulating access to digital content includes an interface control processor and a specialized cryptographic unit that protects access to a memory. Rights keys, which allow access to content, are added by the cryptographic unit by transforming data received from the control processor and storing the result in the protected memory. The cryptographic unit then produces content decryption keys by using stored rights keys to transform other data received from the control processor. Because the control processor does not have the ability to directly access the protected memory, the security can remain effective even if the control processor is compromised. To prevent reverse engineering of the cryptographic transformations, the invention provides for an algorithm generator that uses random sources to produce algorithm definitions in machine-readable form. Because the generator itself does not contain any secrets, it can be submitted for open review.

Abstract: A decoder for descrambling encoded satellite transmissions comprises an internal security element and a replaceable security module. The program signal is scrambled with a key and then the key itself is twice-encrypted and multiplexed with the scrambled program signal. The key is first encrypted with a first secret serial number (SSN1) which is assigned to a given replaceable security module. The key is then encrypted with a second secret serial number (SSN0) which is assigned to a given decoder. The decoder performs a first key decryption using the second secret serial number (SSN0) stored within the decoder. The partially decrypted key is then further decrypted by the replaceable security module using the first secret serial number (SSN1) stored within the replaceable security module. The decoder then descrambles the program using the twice-decrypted key. The replaceable security module can be replaced, allowing the security system to be upgraded or changed following a system breach.

Abstract: A copy prevention method and apparatus for a digital video system is disclosed including the steps of: (a) adding a header area of a header start code and key field to a reproduced bit stream: stream; (b) decrypting and transmitting the bit stream to which the header area is added: added; (c) detecting a key field of the decrypted and transmitted bit stream and detecting copy prevention information; and (d) encrypting the bit stream according to information detected from stop step (c) and optionally recording it an on a tape.

Abstract: A transmitter for transmitting news data via satellite and which includes an information storage unit for storing news data, an information scramble processing unit for scrambling the news data using a predetermined first key to output once scrambled news data, a data scrambler for scrambling the once scrambled news data using a predetermined second key and outputting twice scrambled news data, a transmitter for broadcasting the twice scrambled news data via a transmitter antenna to a receiver which includes a data descrambler for descrambling the twice scrambled news data using the second key and outputting once descrambled news data, a storage medium for storing the once descrambled news data, an information descramble processing unit for reading the once descrambled data from the recording medium and descrambling the once descrambled news data using the first key to produce fully descrambled news data, and a user terminal for reading the fully descrambled news data.