The invention provides a method, system, and computer program product to control the access, copying, and/or transfer of a digital asset by mobile, wireless devices using a digital voucher. The digital voucher references a primary content that contains all of the expression for that particular asset and a secondary content that contains information that can be distilled out as a preview. The information in the primary content can be limited to a specified duration or a specific number of viewings. The author, owner, or possessor of the digital asset specifies the terms and conditions for distribution of the digital asset. The digital voucher authorizes the mobile, wireless device to access a specified primary or secondary content that may be located elsewhere in the network. The mobile, wireless device can download a copy of portions or all of the content depending on the terms specified in the voucher.

Digital rights management in a mobile communications environment

A system for handling data and transactions involving data through the use of a virtual transaction zone, which virtual transaction zone removes the dependency of such transaction on the delivery medium of the product. The invention may reside and operate on a variety of electronic devices such as televisions, VCRs, DVDs, personal computers, WebTV, any other known electronic recorder/player, or as a stand alone unit. The transaction zone also provides a mechanism for combining mediums, data feeds, and manipulation of those feeds. The transaction zone also provides a mechanism for controlling the content, delivery, and timing of delivery of the end consumer's product.

System for data management and on-demand rental and purchase of digital data products

A rights management arrangement for storage media such as optical digital video disks (DVDs, also called digital versatile disks) provides adequate copy protection in a limited, inexpensive mass-produceable, low-capability platform such as a dedicated home consumer disk player and also provides enhanced, more flexible security techniques and methods when the same media are used with platforms having higher security capabilities. A control object (or set) defines plural rights management rules for instance, price for performance or rules governing redistribution. Low capability platforms may enable only a subset of the control rules such as controls on copying or marking of played material. Higher capability platforms may enable all (or different subsets) of the rules. Cryptographically strong security is provided by encrypting at least some of the information carried by the media and enabling decryption based on the control set and/or other limitations. A secure “software container” can be used to protectively encapsulate (e.g., by cryptographic techniques) various digital property content (e.g., audio, video, game, etc.) and control object (i.e., set of rules) information. A standardized container format is provided for general use on/with various mediums and platforms. In addition, a special purpose container may be provided for DVD medium and appliances (e.g., recorders, players, etc.) that contains DVD program content (digital property) and DVD medium specific rules. The techniques, systems and methods disclosed herein are capable of achieving compatibility with other protection standards, such as for example, CGMA and Matsushita data protection standards adopted for DVDs. Cooperative rights management may also be provided, where plural networked rights management arrangements collectively control a rights management event on one or more of such arrangements.

Cryptographic methods, apparatus and systems for storage media electronic rights management in closed and connected appliances

The present invention provides a system to ensure security of data in a computer network system A center certifies a public-key of user of the system and distributes a secret-key A first system comprises the center in a network, an information provider and a plurality of users The center identifies utilization status by requests of the secret-key The data is encrypted by the secret-key and is stored and transferred, while the data to be stored and transferred is encrypted by a secret-key different from the secret-key of the transferred data An original data label is added to the original data, and an edit label is added to the edited data, and the center does not store the data and stores only the original data label and the edit label A second system comprises a center and an information provider in a network, and a plurality of users utilizing the network The center stores the original data and editing scenario, and also the original data label, user label and edit label The data is not transferred between the users, but data label encrypted by the public-key is transferred In electronic commerce system, every data is distributed through a mediator in the network, data which is transferred from a maker to a user is encrypted by a secret-key for encryption, and data which is transferred from the user to the maker is encrypted by a secret-key for re-encryption

Data management system

A method and apparatus for providing a virtual video on demand services is disclosed. The method and apparatus disclose the storing of a segment of the video program in advance for VOD viewing at a later time. When the subscriber selects VOD service, a pre-stored video segment is retrieved for presentation to the subscriber. Remaining video program segments simultaneously broadcast on a plurality of channels are recorded in parallel while the pre-stored video program segment is retrieved and presented to the user.

Virtual video on demand using multiple encrypted video segments

An apparatus comprising a transmission system for transmitting an information signal, and a reception system including an information receiving unit for receiving the information signal, and an information recording/reproducing unit for recording/reproducing the received information signal on/from a recording medium. The reception system includes a specific information storage circuit for storing specific information which is assigned peculiarly to the reception system in advance, a specific information donating circuit for adding the specific information to the received information signal or encrypting the received information signal on the basis of the specific information to supply the resulting information signal to the information recording/reproducing unit, and a specific information judgement circuit for receiving an information signal reproduced by the information recording/reproducing unit and verifying the information signal with a condition based on the specific information stored in the specific information storage circuit so that when the condition is satisfied, a signal obtained by deleting the specific information added to the reproduced information signal or by decrypting the encrypted information signal is outputted.

Information receiving and recording/reproducing apparatus/method having function for limiting/delimiting for protecting copyright of recording information

Method and apparatus for detecting and correcting code errors in processing a digital signal such as a digital audio signal are disclosed. An error word correcting parity word generated from a plurality of data words is added to the plurality of data words to form a first frame, and the data words and the parity word of a plurality of different first frames are distributed in a second frame and a plurality of additional parity words for detecting and correcting error words in the second frame are added to the second frame to form a Reed-Solomon code. The code errors are detected and corrected using this code. A code error rate counter is provided, and when an output of the code error counter exceeds a predetermined count, the code error correction is inhibited for a predetermined time period or until the code error rate reaches a second predetermined code error rate.

Code error detection and correction method and apparatus

A digital information signal transmitting/receiving method and system having a transmitter for transmitting an encrypted digital information signal and a plurality of receivers for receiving the encrypted digital information signal from the transmitter. The transmitter simultaneously distributes a plurality of identification codes associated with the receivers at a time ahead of the digital information signal. The receivers detect whether a particular identification code assigned to the receiver was included within a received plurality of identification codes. When the particular identification code has been detected as having been received the received encrypted digital information signal is decrypted into the original digital information. In order to request that a particular identification code be included so as to allow access to a program, either one of the receivers or the recorders each generate an information request signal. The transmitter is responsive to the information request signals to add to the digital information signal at a time ahead of the digital information signal, identification signals for identifying the receivers or the recorders which generated the information request signals, thereby producing a transmission signal formed of those signals, and to distribute this transmission signal to the receivers. The recorders control the received information signal to be recorded in response to the identification signals received by the receivers.

Digital information signal transmitting/receiving method and system

PURPOSE: To execute digital sound recording in a domestic VTR, and also, to obtain a PCM recording and reproducing device having no mutual disturbance to a video signal in its method, by providing a code conversion circuit for bringing a PCM audio signal or a digital data to a code inversion alternately by 2 bits each, by a word unit, on a recording side and a reproducing side. CONSTITUTION: An audio signal which has been inputted to an input terminal 1 is converted to a digital signal by an A/D converter 21, 2 bits each are brought to a code inversion by a word unit by a code converter 22, a synchronizing signal and an error correcting code are added by a digital signal processing circuit 23, and a processing of an interleave, etc., is performed. In an O-QDPSK modulation circuit 24, an O-QDPSK modulation is executed so that its spectrum is held between occupied areas of a low band conversion chromaticity signal and a low carrier wave FM luminance signal. Subsequently, this O-QDPSK modulating signal is recorded in advance of video recording onto a video track by using audio signal exclusive heads 93a, 93b whose azimuth angle is different from that of heads 92a, 92b for video signal. As for this O-QDPSK modulating signal, the surface layer part is erased by a video signal which is recorded afterward, and it remains in a deep layer part. COPYRIGHT: (C)1987,JPO&Japio

Pcm recording and reproducing device

An image recording and reproducing apparatus can record and reproduce both of a digital signal and an analog signal. Operations of a broadcast receiving apparatus and a recording and reproducing apparatus are integrated and superimposition of information on an analog image is realized during recording and reproduction of a digital signal. The broadcast receiving apparatus and the recording and reproducing apparatus communicate with each other to be able to set and obtain states of the opposite apparatus, so that one of the apparatus notifies information of the other apparatus to a user and causes the user to set the information in a picture having the same form as a picture used to notify a state of one apparatus to the user and to cause the user to set the state. Further, before information is superimposed on an analog image signal, a signal conforming in phase to a reference signal of a digital signal is produced in a servo circuit and a reference signal of an analog image signal is supplied to an analog OSD circuit during superimposition of information. At the same time, a reference signal used in the servo circuit is changed over to the reference signal produced in the servo circuit. Thus, the user's operation is simplified.

Nobutaka Amada

Papers

Information receiving and recording/reproducing apparatus/method having function for limiting/delimiting for protecting copyright of recording information

Code error detection and correction method and apparatus

Digital information signal transmitting/receiving method and system

Pcm recording and reproducing device

Image recording and reproducing apparatus