File, 1984, registered by a series of marks, the concatenation the form of a message and method of extraction of a mark of such a file, 1984, mark

摘要

The digital file marked (10) comprises several parts, some of which (12) are marked by a mark (14) of a series of marks so as to form a series of parts marked (12). The concatenation of the marks (14) of the following form a message. Each mark (14) contains an identifier (i, i0 to 15, j0 to j2) of the mark (14), defined by a digital value, this value varying a mark (14) to one another as a function of the order of the marks (14) in the remainder of the marks. The following parts marked (12) comprises in - sequences of at least two parts marked (12), such that all the parts (12) of a same under - following are marked by a mark (14).