Method of detecting changes occurring in image editing using watermarks

A method of editing a digital image having embedded data associated therewith, comprising:

• embedding a first watermark in the original image according to a first watermarking scheme which associates first watermark information with each pixel in the original image;
• embedding a second watermark in the original image according to a second watermarking scheme which associates second watermark information with each non-overlapping group of pixels in the original image;
• editing the embedded image;
• extracting the first watermark information from the edited embedded image to determine which pixels of the original image were edited;
• extracting the second watermark information from the edited image to determine which blocks of pixels were moved or cropped;
• using the extracted second watermark information to determine which blocks of pixels were edited;
• using the extracted first watermark information to synchronize the second watermark information;
• and
• associating the embedded data with those portions of the original image that were edited, moved or cropped.