| US 7,549,176 B2 | ||
| Recording medium, information playback apparatus and method, and information recording and playback apparatus | ||
| Munetake Ebihara, Kanagawa (Japan); Takamichi Hayashi, Tokyo (Japan); Mitsuru Katsumata, Tokyo (Japan); and Hiroyuki Ichikawa, Tokyo (Japan) | ||
| Assigned to Sony Corporation, Tokyo (Japan) | ||
| Filed on Jul. 12, 2004, as Appl. No. 10/887,818. | ||
| Claims priority of application No. 2003-274301 (JP), filed on Jul. 14, 2003. | ||
| Prior Publication US 2005/0055314 A1, Mar. 10, 2005 | ||
| Int. Cl. G06F 7/04 (2006.01); G11B 19/02 (2006.01) | ||
| U.S. Cl. 726—32 [369/47.12] | 13 Claims |
| 1. A recording medium configured to be accessed by a recording/reproducing apparatus, comprising:
an encoding key;
encoded information that is encoded using the encoding key; and
at least two usage right files each having usage rights corresponding to a respective one of two physically distinct media
types,
wherein the encoding key, the encoded information, and the at least two usage right files are recorded in predetermined regions
of the recording medium, and a physically distinct property of the recording medium is detected by the presence of eight-to-fourteen
modulation (EFM) data in a region further towards the center than the table of content (TOC) in the lead-in area by the recording/reproducing
apparatus for determining which of the two physically distinct media types corresponds to the recording medium, the recording/reproducing
apparatus selecting the corresponding usage right file of the at least two usage right files to manage reproduction of the
encoded information.
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