Abstract:
A recording medium includes an area for recording data which has been subjected to error correction/coding by a first error correction code. In this area, data of a format decodable by a second error correction code which is different from the first error correction code is mixed/recorded. The data of the format decodable by the second error correction code constitutes at least a part of encryption key data.
Abstract:
A disk is provided with data areas (AR1, AR2), lead-in areas (LIN1, LIN2) and lead-out areas (LOUT1, LOUT2). For example, when data is enciphered and recorded in the data area (AR2), copyright managing information and (R2) key information (K2) are recorded in the lead-out area (LOUT2). Only the Q-channel information of sub-code is recorded in the lead-out areas, which are embedded with dummy data. The lead-out positions can be determined from the information in the TOC, and it can be judged from the Q-channel information that the information is recorded in the lead-out areas. By using these lead-out areas, the copyright managing information and the key information are recorded. The lead-out areas are neither rewritten nor accessed by an ordinary CD player, so that the copyright managing information and the key information can be safely stored.
Abstract:
A recording method for an optical disc which records data for identifying an optical disc on the optical disc wherein the identifying data is recorded by irradiating an optical disc having a substrate made of a synthetic resin with an uneven pattern on one face and a reflection film made of a metal material so provided as to cover the uneven pattern of the substrate with an optical beam to cause the previously formed uneven pattern to change physically.
Abstract:
Datenaufzeichnungsgerät, das aufweist: Eingangs-Interfaceeinrichtungen (22..25) für die Eingabe von Eingangsdaten, wobei jeder von zumindest zwei der Eingangs-Interfaceeinrichtungen (22..25) einer anderen Sicherheitsstufe bezüglich illegalen Kopierens von Daten zugeordnet ist, eine erste Detektoreinrichtung (30) zum Detektieren einer ersten Zusatzinformation, die in die Eingangsdaten eingebettet ist, eine zweite Detektoreinrichtung (39) zum Detektieren einer zweiten Zusatzinformation (DRM), die an die Eingangsdaten angefügt ist, eine Aufzeichnungseinrichtung (36) zum Aufzeichnen der Eingangsdaten auf ein Speichermedium (40) und eine Steuereinrichtung (100) zum Steuern der Aufzeichnungseinrichtung (36) nach Maßgabe der detektierten ersten oder zweiten Zusatzinformation, dadurch charakterisiert, daß wenn die aufzuzeichnenden Eingangsdaten mittels der Eingangs-Interfaceeinrichtung (22..25), welcher von den zwei der Eingangs-Interfaceeinrichtungen (22..25) die höchste Sicherheitsstufe zugeordnet ist, eingegeben werden, die erste Detektoreinrichtung (30) die erste Zusatzinformation nicht detektiert und die Steuereinrichtung (100) die Aufzeichnungseinrichtung (36) nach Maßgabe der von der zweiten Detektoreinrichtung (39) detektierten zweiten Zusatzinformation steuert.
Abstract:
The present invention provides an optical disc recording method of irradiating an optical beam to an optical disc including a basal plate made of synthetic resin which has a concavo-convex pattern formed in advance on one surface thereof, and a reflective coat made of metal which is formed over the concavo-convex pattern on the basal plate, to physically change the concavo-convex pattern so as to record identification data.
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
Abstract:
Main data and a sub-code from input terminals (1a, 1b) are processed by encoders (2a, 2b) and supplied to an EFM modulation section (4) via a multiplexer (3). The EFM modulation section (4) consists of an 8-14 conversi on section (5a) and a connection bit selection section (5b). For the EFM modulation section (4), there are prepared DSV normal control (7a) and DSV special control (7b). The DSV special control is performed only in a predetermined section preset on an optical disc. The DSV special control is a control in the direction to increase the DSV absolute value to a degree causing a danger of preventing normal data reproduction. The normal control is a control in the direction to converge the DSV absolute value to 0. During reproduction, if the reproduction state of a predetermined section is not normal, the disc is judged to be an original disc. It is possible to record an encryption key in a predetermined 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:
According to the type of each of a plurality of external input interfaces, it is decided whether digital watermark information is to be detected from data entered via the external input interface. Digital watermark information is not detected from data entered via the external input interface and from which it has been decided not to detect any digital watermark information, but the data is recorded. Thus, there can be provided a data recording apparatus which is not applied with a any heavy load owing to the omission of any unnecessary detection of digital watermark information.