Optical disc drive
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshihiro Kanada, Yoshihisa Fukushima, Masaru Odagiri
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Abstract
In a recordable data storage medium on which property data was recorded after having been modulated and on which data that is decodable by a cryptographic key to be generated from the property data was recorded, the property data was preferably modulated by a different method from that applied to a read-only data storage medium. Then, an optical disc drive, having no ability to distinguish the recordable data storage medium from the read-only data storage medium, cannot read the recordable data storage medium. Consequently, a greater number of drives should be equipped with the function of recognizing the type of a given data storage medium and the copyright protection function should be consolidated.
Claims9
An optical disc drive for reading user data from a recordable data storage medium, on which modulated property data, unique to the recordable data storage medium, was recorded and on which the user data to be used by a user is writable in a first data format, the optical disc drive comprising:
- a type recognizing section for distinguishing the recordable data storage medium from a read-only data storage medium;
- and
- property data reading means for reading the property data, said property data reading means reading one of a second data format and a third data format in accordance with a result obtained by the type recognizing section, wherein a modulation method of the third data format bears an inverse relationship to a modulation method of the second data format.
Dependencies are inferred from the claim text.