Abstract: The invention relates to a method of watermarking a data set comprising the steps of: selecting, in the data set, at least one group of two data; and modifying at least one data of the group. The data is modified such that the difference between the modified data and the other data of the group possibly modified equals a predefined watermarking parameter multiplied by an integer number, called rejection class, associated with the group and equal to the integer nearest to the ratio between the difference between the at least one data and the other data of the group before the modification divided by the watermarking parameter.

Abstract: The invention relates to a method of watermarking a data set comprising the steps of: selecting, in the data set, at least one group of two data; and modifying at least one data of the group. The data is modified such that the difference between the modified data and the other data of the group possibly modified equals a predefined watermarking parameter multiplied by an integer number, called rejection class, associated with the group and equal to the integer nearest to the ratio between the difference between the at least one data and the other data of the group before the modification divided by the watermarking parameter.

Abstract: The invention relates in particular to a stream-wise method of watermarking independent of the compression parameters used (for example type of the transform) so as to allow the reading of the watermarking inserted independently of the format of the data received. The watermarking method according to the invention consists in generating a contribution matrix in the transformation space, in projecting it into another domain and in watermarking the data in this domain on the basis of the projected matrix so as to allow a watermark reader operating in the transformed transformation space to read back the inserted watermarking in the transformation space. The contribution matrix representing the modifications induced on the coefficients in the transformation space by insertion of the watermarking cue in this same domain.

Abstract: The invention relates to a digital data set watermarking method including the following steps: a. Generating, from at least one part of the digital data set, a first set of M n-uplets representative of the digital data set where n and M are integers, M?1 and n?1, b. Determining, in a predefined batch of K n-uplets, a set of M n-uplets, called second set, closest in the sense of predefined metrics to the first set where K is an integer and K?M, and c. Modifying at least one data item of the digital data set in such a way that the first set generated according to step a) from the modified data set is equal to the second set.