1. A method of distributing digital image content, comprising: producing a scrambled modified digital image content, altered from the point of view of human visual perception, from an original digital image content by replacing at least a part of coefficients of the original digital image content by values different from original values, the original digital image content being in a nominal compressed format other than encrypted, said modified digital image content being of the same nominal compressed format as the original digital image content; producing complementary information having a granular scalability structure which enables the decoder to obtain a reconstituted digital image content, said complementary information comprising the original replaced coefficients and corresponding locations in the original digital image content and at least one function containing at least one instruction; transmitting the modified digital image content to a recipient; transmitting the complementary information, as a whole or in part as a subset of the entire complementary information, to the recipient, the subset being determined based on a digital profile of the recipient and being adaptive and progressive as a function of said digital profile; and reconstructing, at the recipient, said reconstituted digital image content from the modified digital image content and from the complementary information by replacing the modified coefficients from the modified digital image content by values contained in the complementary information at locations indicated by the complementary information.