| 摘要 |
An information processing apparatus is provided which processes stream data including, in a non-encrypted region, pointer information designating keys used for decoding of data in an encrypted region of the stream data. In this processing, the apparatus detects change of the pointer information extracted in decoding of the stream data, and generates a decoding key of the stream data on the basis of key generation data, in response to a trigger of agreement between the changed pointer information and information set separately. The method decodes the data in the encrypted region of the stream data by using the generated decoding key.
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