Importance

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Abstract

In an image object managing technology, a copyright and a right of portraits of images such as mobile pictures can be easily managed. When a producer creates a stream of video images, an identical identifier is assigned in all video images, in response to indication from the producer, to object streams of objects which is regarded as identical by the producer. To retrieve a particular object later from the video stream, the particular key assigned in the creation of the video stream is employed as a retrieval key. The object stream includes an encryption field. Using an encryption key only known by the producer, at least part of data of the identifier or data field is encrypted to be written in the encryption field. An identifier extracted from data obtained by decoding the encryption field using the encryption key is compared with an identifier in the object stream to thereby detect modification of the identifier.

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First Claim