| 摘要 |
The invention concerns a marked digital file (10) comprising several parts some of which (12) are marked by a mark (14) of a series of marks so as to form a series of marked parts (12). The concatenation of the marks (14) of the series forms a message. Each mark (14) contains an identifier (I, I0 to I5, J0 to J2) of the mark (14), defined by a digital value, said value varying from one mark (14) to the next depending on the order of the marks (14) in the series of marks. The series of marked parts (12) comprises sub-series of at least two marked parts (12), such that all the parts (12) of a common sub-series are marked by a common mark (14). |
