Abstract: A method for recording data comprising: forming recording data by adding a pattern of connection bits selected from among a plurality of patterns of connection bits to the end of an m-bit data symbol, the selected pattern of connection bits causing an increase in an accumulated value of direct-current components per unit time when the n-bit data symbol is a special data symbol and is added to a data symbol other than the special data symbol, when m-bit data is converted into the n-bit data symbol (m<n) and when the pattern of connection bits is selected from among the plurality of patterns of connection bits to decrease the accumulated value of direct-current components per unit time to be added to the end of the m-bit data symbol; and recording the recording data formed and data indicating a recorded location of the special data symbol on a recording medium.

Abstract: A CD which cannot practically be copied. A recording method, wherein, when a certain portion of main data is recorded by being encoded by a first encoding method and the other portions of the main data is recorded by being encoded by a second encoding method, an encoding process is performed by the first encoding method so that, when data which is recorded in such a manner that the data encoded by the first encoding method is decoded by a decoding method corresponding to the first encoding method, and thereafter, is further encoded by the second encoding method, is decoded by a decoding method corresponding to the second encoding method, the sum value of DC components per unit time increases.

Abstract: The present invention provides a data processing method for encrypting or decrypting contents data using contents key data. The method comprises generating the reference information including data encrypted from contents key data using a plurality of device key data proper to a plurality of apparatus, by encrypting the contents key data using the device key data associated with those of the plural apparatus for which recording or reproduction is allowed, supplying the generated reference information along with the device key data to the plural apparatus, decrypting the contents key data from the supplied reference information, by the plural apparatus, using the device key data proper to the plural apparatus, and encrypting or decrypting the contents data using the decrypted contents key data.

Abstract: Unique identification information is prerecorded on a disc. The identification information is registered to a server along with user's license when he or she buys the disc. When an terminal unit reproduces data from the disc, identification information is read and transmitted to the server through the Internet. The server creates a key that controls to reproduce data from the disc in accordance with the license identified by the identification information and transmits the key to the terminal unit along with the user's license information for the disc. The terminal unit controls to reproduce contents of the disc in accordance with key and license information transmitted from the server. The license for each disc is managed in accordance with the identification information. Thus, different services can be provided for individual discs.

Abstract: A recording medium having an area in which data that has been encoded with a first error correction code is recorded, wherein data that can be decoded with a second error correction code that is different from the first error correction code is recorded to the area along with the data that has been encoded with the first error correction code, and wherein the data that can be decoded with the second error correction code composes at least part of encryption key data.

Abstract: A method for controlling access to data of a disc, comprising the steps of determining whether or not information intrinsic to a writable disc has been detected from data that had been read from the disc; when the determined result represents that information intrinsic to a writable disc has been detected, determining that the disc is a writable disc and at least restricting a regular operation of the disc; and when the determined result represents that information intrinsic to a writable disc has not been detected, determining that the disc is not a writable disc and executing a regular operation of the disc.

Abstract: The present invention is a recording medium comprising a lead-in area, a data record area for recording encrypted content data, and a lead-out area, wherein key information for decrypting the encrypted content data is recorded in at least one of the lead-in area and the lead-out area and the program area.

Abstract: A recording medium, comprising a lead-in area, a data recording area that is formed on an outer periphery side of the lead-in area and in which a plurality of pieces of content data is recorded, and a lead-out area formed on an outer periphery side of the data recording area, wherein first copyright management information and second copyright management information with which copyrights of the plurality of pieces of content data are managed are recorded at different positions whose secrecies are different from each other.

Abstract: The invention provides an information recording medium, a storage medium, an information reproduction apparatus and method, and an information recording and reproduction apparatus and method as well as a providing medium by which information recorded on an information recording medium can be utilized only by a predetermined apparatus which corresponds to the information recording medium. A ROM has data for identification of a DVD player/recorder stored therein. A recording and reproduction section records data stored in the ROM onto a DVD and reproduces data for identification of the DVD player/recorder recorded on the DVD. A CPU controls the recording and reproduction section in accordance with the data stored in the ROM and the data reproduced by the recording and reproduction section.

Abstract: A recording medium on which at least one piece of data that has been encoded with a first error correction code and data that can be decoded with the first error correction code and that can be decoded with a second error correction code that is different from the first error correction code.

Abstract: First, an ID added disc is loaded. A disc ID is read from the disc at step S2. The disc ID matches a hardware ID of hardware that can use software recorded on the disc. If the disc ID has not been read from the disc, an error process is performed. At step S3, a hardware ID of hardware connected to a personal computer is obtained. At step S4, it is determined whether or not both the IDs match. When the determined result represents that they match, at step S5, an application starts. When the determined result at step S4 represents that they do not match, at step S6, an error message is displayed on a display of the personal computer.

Abstract: On a data recording medium which is divided into sectors and can be accessed on the sector unit basis, when encoded data is divided every predetermined length, a header is added, the data is packetized, a header is further added to the packet to thereby form the pack data, and the resultant data is recorded, if the stuffing is necessary, the stuffing data is inserted to the last of a data area of the packet. Thus, a length of pack header can be fixed. There is no need to provide a padding packet. A situation such that a PES header is encrypted is prevented and no problem occurs when encryption is performed.

Abstract: The present invention is relative with a method for recording further data on a recording medium on which there re pre-recorded data obtained on modulating M-bit data to N-bit data, where M<N. The further recorded data are recorded by changing a certain bit or bits of the N-bit data, with the remaining portion of the bits of the N-bit data being fixed.

Abstract: A recording method for a recording medium, wherein an encrypting process is executed to inputted contents data by using either key data which becomes key data only for use of the recording medium by being recorded or fixed value data and, when an encoding process is executed to the encryption-processed data, if the key data which becomes the key data only for use of the recording medium by being recorded is used at the time of the encrypting process, the key data which becomes the key data only for use of the recording medium by being recorded is embedded, and the encoding-processed data is recorded onto the recording medium.

Abstract: A recording method includes the steps of generating recording data in such a manner that, when m-bit data is converted into a data symbol of n bits (m<n), and connection bits such that the summed value of DC components per unit time decreases are selected from among a plurality of connection bits and are added after the m-bit data symbol, the connection bits differing from connection bits which are added when the n-bit data symbol is a data symbol other than the special data symbol are added to generate recording data; and recording the generated recording data on a recording medium.

Abstract: A recording medium reproducing method is disclosed. It is judged whether or not content data which has been read from a recording medium is encrypted content data. When content data which has been read from the recording medium is encrypted content data, third key data (key locker key data) for decrypting encrypted content key data which has been read from the recording medium is generated with at least first key data (medium bind key data) and second key data (medium key block) which has been read from the recording medium. With the content key data decrypted with the third key data, the encrypted data which has been read from the recording medium is decrypted.

Abstract: An administrative system receives unique ID information of disk from an orderer for ordering manufacture of the disks and provides the unique ID information for a disk maker. The maker stores on the disk unique attribute information of the disk including identification information for the disk makre side. The administrative system obtains normal recording information generated if normal recording is carried out when recording on the disk the unique attribute information of the disk. Alternatively, the administrative system obtains abnormal recording information generated if abnormal recording is carried out. Disk administrative information, for example, number of pieces of the disks delivered from the factory, is generated from the obtained normal and abnormal recording information.

Abstract: A method for processing content data includes the steps of, when content data is transmitted from a data provider, adding usage rule information prescribing a rule of usage of the content data to the content data and transmitting the content data with the usage rule information; receiving the transmitted content data; extracting the usage rule information from the received content data; and notifying a user of the content data of the extracted usage information.

Abstract: A recording medium includes an area in which data encoded with an error correction code is recorded. In the recording medium, data which contains an error uncorrectable with the error correction code, and data which does not contain an error uncorrectable with the error correction code are recorded in predetermined pattern.

Abstract: A contents data processing method comprises the steps of, at the time of processing contents data, reproducing character information changed with processing of the contents data, and selectively changing processing of the contents data in accordance with the reproduced character information.