Abstract: A memory card (110) includes a memory (1415) to store encrypted content data, a license hold unit (1440) to store at least a portion of license information distributed by a distribution system, a plurality of authentication data hold units (1400.1, 1400.2), each storing a plurality of authentication data that are authenticated respectively by a plurality of public authentication keys KPma, KPmb common to the distribution system, and a switch (SW2) to selectively provide the data from the plurality of authentication data hold units outside of said recording apparatus according to a request external to the memory card (110).

Abstract: A portable telephone set capable of recognizing a call during music replay is disclosed. This portable telephone set comprises talking means and music replay means, and posts a call when receiving the same during music replay by the music replay means. Thus, the call can be recognized during the music replay.

Abstract: A hard disk unit includes a data storage region. The data storage region includes a user region and a non-user region. The user region is formed of a normal data storage region storing non-classified data and a protection data storage region storing classified data. The non-user region is formed of an administration data storage region. The administration data storage region stores a certificate revocation list CRL and an administration table of the classified data. Logical addresses of 0-maxLBA are assigned to the user region, and logical addresses of (sLBA+1)-maxLBA among them are assigned to a protection data storage region. By changing sMAX in accordance with an external instruction, the region of the protection data storage region is changed.

Abstract: A magneto-optical record medium and a reproducing apparatus for the same allow data reproduction having good characteristics by a simple structure. The magneto-optical record medium includes a plurality of first grooves (3) each having sidewalls, at least one of which is wobbled in accordance with address information; an address mark (21) formed by changing a width of a land located between second grooves connected to the first grooves; and third grooves wobbled cyclically, formed in a data portion magnetically storing data and connected to the second grooves. The reproducing apparatus reproduces the data from the magneto-optical record medium.

Abstract: In a hard disk unit, encrypted content data is stored in two hard disks by a storage read processing unit. A license required to decrypt the encrypted content data is stored in a secure data storage region of a memory unit. The memory unit is formed by a semiconductor device, and can be accessed independent of the hard disk units.

Abstract: In a cellular phone, a controller stores content data and additional information obtained from a distribution server into a memory. When the content data is to be transmitted to a memory card, a random number key generation unit generates a license key. An encryption processing unit encrypts the content data using the license key. The controller transmits the encrypted content data to the memory card via a memory card interface. Then, the controller deletes only the content data stored in the memory. As a result, distribution of content data that must be deleted when the obtained content data is to be transmitted to another apparatus can be facilitated while protecting copyright thereof.

Abstract: A memory card (110) stores access restriction information (AC1) to a license information hold unit (1440) arranged in a TRM area. Access restriction information (AC1) has information for example of a frequency of reproduction allowed and a number of licenses owned. A controller (1420) in reproducing and transferring content initially confirms access restriction information (AC1) and thereafter effects reproduction and transfer and after the reproduction and transfer are effected updates access restriction information (AC1), as required, for storage in a license information hold unit (1440).

Abstract: A license server (10) includes a CRL database (306) holding a revocation list recording therein classes predetermined corresponding respectively to a memory device, such as a memory card, and a content reproduction circuit, such as a cellular phone, that are subjected to revocation of distributing, reproducing and transferring content data. A distribution control unit (315) suspends an operation distributing content data if the distribution is addressed to a class listed on the revocation list. The revocation list is also held in the memory card and distribution control unit (315) in distributing content also transmits information for updating the revocation list in the memory card.

Abstract: A cellular phone (100) stores encrypted content data and encrypted license key distributed thereto in a memory card (110). The cellular phone (100) and the memory card (110) collectively perform a part of mutual authentication processing upon power-on. The encrypted license key (Kc) read from the memory card (110) is decrypted by a first decryption processing portion (1510) with a session key (Ks4), and is further decrypted by a second decryption processing portion (1514) with a system symmetric key (Kcom) for extraction. A third encryption processing portion (1516) decrypts the encrypted content data read from memory card (110) with the license key (Kc) to reproduce content data (Data).

Abstract: A memory card (110) decodes data delivered to a data bus (BS3) and extracts a session key (Ks1) sent from a server from the data. Based on the session key (Ks1), an encrypting section (1406) encrypts a public encryption key (KPm (1)) of the memory card (110) and delivers it to a server through the data bus (BS3). The memory card (110) receives data including a license key (Kc) and a license (ID) encrypted with the public encryption key (KPm (1)) different with memory card to memory card, decrypts the data, encrypted it again with uniquely given secret key (K(1)), and stores it in a memory (1415).

Abstract: A memory card (110) conducts an authentication process with a server based on data stored in an authentication data hold unit (1400). The memory card (110) extracts a first session key (Ks1) from a server by a decryption process and a transaction ID from the data applied on a data bus (BS3). The memory card (110) generates a second session key (Ks2) through a session key generation unit (1418), and transmits to the server, as the keys to encrypt content data in receiving decryption of content data, the second session key (Ks2) and a key (KPm(1)) unique to the memory card (110) in an encrypted state with the first session key (Ks1). The transaction ID and the second session key (Ks2) stored in the log memory (1460) are used in the redistribution process.

Abstract: In a cellular phone, a controller stores content data received from a distribution server into a memory. When the content data is to be transmitted to a memory card, a random number key generator generates a license key, and an encryption processing unit encrypts the content data using the license key. The controller transmits encrypted content data to a memory card via a memory card interface. Then, the controller deletes the content data stored in the memory. As a result, distribution of content data that must be deleted when transferring to another apparatus can be facilitated while protecting the copyright.

Abstract: A personal computer obtains music data and identification information of the music data from a CD and transmits the identification information to a license management server on the Internet. The personal computer receives an encryption key and additional information of the music data from the license management server. The personal computer encodes the music data in an MP3 system to generate content data and encrypts the content data with an encryption key to generate encrypted content data, and uploads the encrypted content data to the personal computer together with the additional information. Thus, while copyright can be protected, encrypted content data can be generated and provided to a site allowing each user to obtain the same.

Abstract: An magneto-optical disc recording/reproducing apparatus includes an optical head (36) to detect a wobble (46) and an address mark (81 to 84) in an magneto-optical disc (31) and output a wobble signal (WB1, WB2) and an address mark signal (AML, AMG), a PLL circuit (47) to generate a clock signal (CK) in response to wobble signal (WB1), an address mark synchronous signal generation circuit (46) to generate an address mark synchronous signal (AM) in response to address mark signal (AML, AMG), a synchronizing circuit (48) to synchronize clock signal (CK) with address mark synchronous signal (AM) and generate a synchronized clock signal (SCK), and a timing setting circuit (49) to generate a timing pulse signal (TG1) to control a magnetic head driving circuit (34) and a timing pulse signal (TG2) to control a laser driving circuit (35).

Abstract: An optical disc and an optical disc drive for the optical disc are provided which are suitable for recording data with a high density.

Abstract: A magneto-optical record medium and a reproducing apparatus for the same allow data reproduction having good characteristics by a simple structure. The magneto-optical record medium includes a plurality of first grooves (3) each having sidewalls, at least one of which is wobbled in accordance with address information; an address mark (21) formed by changing a width of a land located between second grooves connected to the first grooves; and third grooves wobbled cyclically, formed in a data portion magnetically storing data and connected to the second grooves. The reproducing apparatus reproduces the data from the magneto-optical record medium.

Abstract: A table having a plurality of recording densities and a plurality of recording/reproducing conditions corresponding to the recording densities and each necessary for recording/reproducing a signal at a corresponding recording density is recorded in a TOC region of a magneto-optical disk. A recording/reproducing apparatus finds out a recording density at which it can record/reproduce data from the table and records or reproduces a signal at the recording density. The recording/reproducing conditions include the wavelength of a semiconductor laser, whether or not to employ the optical pulse magnetic field modulation recording method, the presence/absence of an optical super resolution pickup, whether or not to employ the optical pulse reproducing method, whether or not to employ the PRML method and the like.

Abstract: An optical disc and an optical disc drive for the optical disc are provided which are suitable for recording data with a high density. The optical disc D uses both lands and grooves as recording tracks. Each of the tracks consists of one address segment and forty five data segments. The address segment is wobbled at one side thereof. Each of the data segments is a DC groove. The address segment records an address information including a sync signal, frame address, track address and CRC, a tilt pattern and a clock mark. The clock mark is adapted to reflect laser beam in one amount before the mark and in another amount after the mark. The tilt pattern has a different track pitch from those in other areas. The data segments record data magneto-optically.

Abstract: A meandering groove is formed in a digital disk (10) with a wobble signal that is wobbled to reproduce a clock signal. The wobble signal is read out by an optical head (26). An address detection circuit (40) detects an address signal that is multiplexed with the wobble signal. A PLL oscillation circuit (24) provides a clock signal in synchronization with the wobble signal. Data is modulated by a modulation circuit (16) according to the clock signal and a timing signal based on the address signal, and recorded on the digital disk (10). In reproduction, a RF signal in the wobble signal is converted into a digital signal by an A/D converter (42). The signal is demodulated by a demodulation circuit (44) for data output.

Abstract: A magneto-optical record medium and a reproducing apparatus for the same allow data reproduction having good characteristics by a simple structure. The magneto-optical record medium includes a plurality of first grooves (3) each having sidewalls, at least one of which is wobbled in accordance with address information; an address mark (21) formed by changing a width of a land located between second grooves connected to the first grooves; and third grooves wobbled cyclically, formed in a data portion magnetically storing data and connected to the second grooves. The reproducing apparatus reproduces the data from the magneto-optical record medium.