| 摘要 |
The invention relates to a signal comprising a data stream 2, 3 containing copy free data 65-67, 71, 75, 77, 83-88 and to a storage medium 15 comprising such a signal. Furthermore, the invention relates to methods and devices for recording 1 and reproducing 17 such signals. In order to avoid illegal copying of data, copy free data is encoded with a copy free signature 76, 80, 92. Thus, it is possible to discern copy free recorded material from illegal bit-true copies of decrypted material.
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