Process and adaptive and progressive system for the secured distribution of fixed pictures coded in wavelets

A process for secured distribution of at least one digital fixed picture in an original stream, wherein the picture includes sequences of data that respectively contain a part of information of the picture, the original stream being in a nominal compressed block format based on wavelets, and the original stream including wavelet coefficients, the process comprising:

• modifying the original stream by modifying the wavelet coefficients to produce a modified stream having the same nominal block format as the original stream;
• generating complementary information including modified information from the original stream, the complementary information also including one or more functions for reconstructing the original stream with the modified information, wherein a respective one of the one or more functions contains at least one instruction relating data associated with the complementary information and/or the modified stream and one or more operators associated with reconstructing the original stream from the modified stream;
• and
• separately transmitting the modified stream and the complementary information to an addressee equipment for reconstruction of the original stream from the modified stream and the complementary information, wherein the reconstruction is adaptive and progressive as a function of information associated with a digital profile of the addressee equipment provided in the complementary information.