Abstract: A method for processing a sequence of digital images. The method includes, for a current group: a) forming a main group including original images partitioned into spatial areas and including a watermarking zone; b) obtaining a main bitstream representing an area-based encoding of the images of the main group, in which for an area other than the watermarking area, the pixels of that zone are not predicted with reference to pixels in the watermarking area; c) for the watermarking area: forming a secondary group of images having the same temporal dimension as the main group and spatial dimensions equal to those of the watermarking area, inserting a first watermarking information value into the secondary group, and obtaining a first secondary bitstream representing images of the encoded secondary group including the first watermarking information value; and d) transmitting the main and first secondary bitstreams in the telecommunication network to a client.