| http://www.w3.org/ns/prov#value | - In this embodiment, if the two kinds of codes C1 and C2 generated by the code generating circuit 33 are modified in a manner as shown in FIG. 12 that each of the codes C1 and C2 includes not only as a part thereof a data section Dt necessary for judging the permission of the dubbing operation but also a dummy data portion Dd unnecessary for judging the permission of the dubbing operation, the head
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