Abstract: A data reproducing apparatus and method is provided for reproducing data that was ciphered during recording in one or more of sector forming, header appending, error correction coding, modulation, and synchronization appending operations used for processing input data to form a recording signal. Thus, deciphering requires knowledge of both the ciphering key and the aspect(s) of the recording operation in which the ciphering took place. The deciphering may also include a descrambling operation in which an initial value and/or a generating polynomial is varied in accordance with ciphering key information.

Abstract: An input is ciphered in at least one of a sector forming circuit 13, a scrambling circuit 14, a header appendage circuit an error correction encoding circuit 16, a modulation circuit and a synchronization appendage circuit 18, used for processing input data for forming a recording signal. Not only key for ciphering itself in the circuits but also the information as to which of the circuits has been used for ciphering becomes the key for ciphering. This realizes ciphering difficult to decode by a simplified structure.

Abstract: The authentication function (221) authenticates a PDA. The content database (224) holds the usage conditions of a content and the information about the content. The communication function (225) controls the reception of the usage conditions and the content information, both transmitted from the PDA. The content management function (222) updates the usage conditions and the content information received, on the basis of the usage conditions and the content information held. The desired content is thereby retrieved quickly.

Abstract: A data transmitting method, a data recording apparatus, a data record medium and a data reproducing apparatus are provided to disallow the encryption to be easily decoded and keep the secrecy of key information higher. The data transmitting apparatus includes an error correction coding process block. In the block, an input converting circuit operates to perform a logic operation with respect to the information data from an interface circuit according to the key data. The converted information data is sent to an encoder for generating parity data. This parity data is mixed in a mixing circuit with information data before conversion. The error correction coding block operates to send the resulting data to a modulating circuit for modulating the data. The modulated data is recorded on a disk record medium.

Abstract: An input is ciphered in at least one of a sector forming circuit 13, a scrambling circuit 14, a header appendage circuit 15, an error correction encoding circuit 16, a modulation circuit 18 and a synchronization appendage circuit 18, used for processing input data for forming a recording signal. Not only the key for ciphering itself in the circuits but also the information as to which of the circuits has been used for ciphering becomes the key for ciphering. This realizes ciphering difficult to decode by a simplified structure.

Abstract: A signal recording/reproducing method and apparatus, signal record medium and signal transmission/reception method and apparatus, whereby a signal recorded on a signal record medium can be identified as being an original signal or a copied signal. A CPU 11 generates, at a pre-set time interval, an identification signal having a meaning at a pre-set time interval, and an identification signal addition circuit 3 adds the identification signal to the video signals and/or the audio signals. A sector forming circuit 5 and circuit components up to a recording/reproducing head 14 record the video signals and/or the audio signals and the ancillary identification signal on an optical disc 12.

Abstract: A signal recording/reproducing method and apparatus, signal record medium and signal transmission/reception method and apparatus, whereby a signal recorded on a signal record medium can identified as being an original signal or a copied signal. A CPU 11 generates, at a pe-set time interval, an identification signal having a meaning at a pre-set time interval, and an identification signal addition circuit 3 adds the identification signal to the video signals and/or the audio signals. A sector forming circuit 5 and circuit components up to a recording/reproducing head 14 record the video signals and/or the audio signals and the ancillary identification signal on an optical disc 12.

Abstract: Contents and its key are supplied in different procedures. License management program authenticates telephone-integrated terminal device and authenticates first server or second server. Server LCM controls the reception of contents and key transmission requests and of data for identifying first server or second server. If data for identifying first server are received, contents and its key are received from first server in a procedure corresponding to first server. If data for identifying second server are received, contents and its key are received from second server in a procedure corresponding to second server. Server LCM controls the transmission of contents and its key to telephone-integrated terminal device.

Abstract: A signal transmission method applicable to prevention of modification or alteration of the playback mode information, such as copying management information or charging information. The playback mode information form a terminal 15P is data-converted for ciphering by a playback mode information appendage circuit 14 in a header appendage circuit 13 responsive to the key information from a terminal 15K and the resulting information comprised of the data and the playback mode information is outputted. The reproducing side effects data conversion on the ciphered playback mode information for deciphering, by a playback mode information detection circuit 26 in a header separation circuit 25, using the key information from a terminal 27K, for taking out the original playback mode information at a terminal 27P.

Abstract: A signal recording/reproducing method and apparatus signal record medium and signal transmission/reception method and apparatus, whereby a signal recorded on a signal record medium can be identified as being an original signal or a copied signal. A CPU 11 generates, at a pe-set time interval, an identification signal having a meaning at a pre-set time interval, and an identification signal addition circuit 3 adds the identification signal to the video signals and/or the audio signals. A sector forming circuit 5 and circuit components up to a recording/reproducing head 14 record the video signals and/or the audio signals and the ancillary identification signal on an optical disc 12.

Abstract: A signal recording/reproducing method and apparatus, signal record medium and signal transmission/reception method and apparatus, whereby a signal recorded on a signal record medium can identified as being an original signal or a copied signal. A CPU 11 generates, at a pre-set time interval, an identification signal having a meaning at a pre-set time interval, and an identification signal addition circuit 3 adds the identification signal to the video signals and/or the audio signals. A sector forming circuit 5 and circuit components up to a recording/reproducing head 14 record the video signals and/or the audio signals and the ancillary identification signal on an optical disc 12.

Abstract: A portable communication terminal for use in a communication system including the terminal and a terminal server, and an implementation of such a communication system. The communication terminal has a telephone communication means operable to accesses a server and/or a data base connected to a portable telephone system network so as to receive multimedia information from the server and/or data base, and a human-machine interface means operable to receive multimedia information supplied from the telephone communication means.

Abstract: Disclosed is an information providing apparatus comprising first reception control means for controlling the reception, from a first information processing apparatus, of user identification data for identifying a user of the first information processing apparatus and a request for purchasing a content, first transmission control means for controlling in response to the request for purchasing the content the transmission of the request for purchasing the content to a second information processing apparatus, second reception control means for controlling the reception of the content and usage conditions thereof supplied from the second information processing apparatus, storage control means for controlling the storing of the content and usage conditions thereof in correlation with the user identification data, third reception control means for controlling the reception of the user identification data and a request for sending the content supplied from the first information processing apparatus, and second trans

Abstract: The present invention is intended to prevent sold digital information from being used in a non-compliant manner. Digital information accumulation capability 212 accumulates digital information 6 to be sold. License generating capability 227 generates the usage conditions for digital information 6. Encryption capability 229 encrypts digital information 6. Digital information key generating capability 228 generates a cryptographic key for decrypting encrypted digital information 6. Authentication capability 214 authenticates recording medium with license management capability 102-1 loaded in digital information vending apparatus 101. Licensed digital information writing capability 230 writes encrypted digital information and its usage conditions and cryptographic key onto authenticated recording medium with license management capability 102-1.

Abstract: An input is ciphered in at least one of a sector forming circuit 13, a scrambling circuit 14, a header appendage circuit 15, an error correction encoding circuit 16, a modulation circuit 18 and a synchronization appendage circuit 18, used for processing input data for forming a recording signal. Not only the key for ciphering itself in the circuits but also the information as to which of the circuits has been used for ciphering becomes the key for ciphering. This realizes ciphering difficult to decode by a simplified structure.

Abstract: The present invention is intended to quickly download contents while preventing unauthorized contents usage. PD authentication program authenticates telephone-integrated terminal device. Server authentication program authenticate key server. Server LCM controls the reception of a request for data for identifying key server and a key from telephone-integrated terminal device. On the basis of the data for identifying key server, server LCM sends a request for the key to key server and receives the requested key from key server. Key distribution program sends the key to telephone-integrated terminal device.

Abstract: A data recording apparatus capable of preventing easily copying of information is disclosed with which, even if information is copied, the copied information cannot be reproduced, the data recording apparatus having a terminal to which encoder ID specific for the data recording apparatus is input, a recording unit for recording at least the encoder ID on an optical disk, and an encoding circuit for, in accordance with the encoder ID, encoding data supplied through a terminal and required to be recorded so that encoded data is, together with the encoder ID, recorded on the optical disk.

Abstract: An information providing system according to this invention comprises a center for providing information, and at least one terminal for accepting an offer of information from the center.

Abstract: A signal recording/reproducing method and apparatus, signal record medium and signal transmission/reception method and apparatus, whereby a signal recorded on a signal record medium can be identified as being an original signal or a copied signal. A CPU 11 generates, at a pe-set time interval, an identification signal having a meaning at a pre-set time interval, and an identification signal addition circuit 3 adds the identification signal to the video signals and/or the audio signals. A sector forming circuit 5 and circuit components up to a recording/reproducing head 14 record the video signals and/or the audio signals and the ancillary identification signal on an optical disc 12.

Abstract: A data recording apparatus capable of preventing easily copying of information is disclosed with which, even if information is copied, the copied information cannot be reproduced, the data recording apparatus having a terminal to which encoder ID specific for the data recording apparatus is input, a recording unit for recording at least the encoder ID on an optical disk, and an encoding circuit for, in accordance with the encoder ID, encoding data supplied through a terminal and required to be recorded so that encoded data is, together with the encoder ID, recorded on the optical disk.