METHOD AND SYSTEM FOR DATA RECORDING / REPRODUCING, APPARATUS FOR RECORDING/REPRODUCING, AND MEDIA FOR RECORDING PROGRAM

WIPO Patent Application WO/1999/038164

A1

Digital data subjected to first encryption with a content key are recorded together with the content key subjected to second encryption. When the encrypted digital data and the encrypted content key are reproduced, the encrypted content key is decrypted and the decrypted content key is used to recover the digital data.

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Yamada, Masazumi (6-24-10, Kinda-cho Moriguchi-shi Osaka, 570-0011, JP)
Iitsuka, Hiroyuki (6-25-6, Kisaichi Katano-shi Osaka, 576-0033, JP)
Goto, Shoichi (5-4-204, Myokenzaka Katano-shi Osaka, 576-0021, JP)
Takechi, Hideaki (Room 201 11-10, Komatsu 4-chome Higashiyodogawa-ku Osaka-shi Osaka, 533-0004, JP)

PCT/JP1999/000292

July 29, 1999

January 25, 1999

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MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1006, Oaza Kadoma Kadoma-shi Osaka, 571-8501, JP)
Yamada, Masazumi (6-24-10, Kinda-cho Moriguchi-shi Osaka, 570-0011, JP)
Iitsuka, Hiroyuki (6-25-6, Kisaichi Katano-shi Osaka, 576-0033, JP)
Goto, Shoichi (5-4-204, Myokenzaka Katano-shi Osaka, 576-0021, JP)
Takechi, Hideaki (Room 201 11-10, Komatsu 4-chome Higashiyodogawa-ku Osaka-shi Osaka, 533-0004, JP)

G11B20/00; H04N5/913; H04N5/775; G11B20/00; H04N5/913; H04N5/775; (IPC1-7): G11B20/10; H04N5/91

Matsuda, Masamichi (Shin-Osaka Ikushima Building 1-3, Miyahara 5-chome Yodogawa-ku Osaka-shi Osaka, 532-0003, JP)

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