Never found much more about this aspect of the Canon RAW-format, being tamperproof because it could only be written by Canon software, from the raw camera data, not by anything else: <http://web.archive.org/web/20030213153914/http://www.colorshots.com/c s101e/html/tipps_raw.html> http://makeashorterlink.com/?Q515127E6 (original document has vanished btw, I had to update the link on my site too) Of course, one could use the Canon digicam as a copying device, copying a tampered image, either analog (slide-copier) or electronic ('screen-grab'; but only at reduced resolution, since no monitor or beamer can achieve the full CCD resolution of the camera (even apart from all kinds of nasty visual effects when pixels meet pixels....;)) Anyone ever read more indepth stuff about this topic? Have insurance companies/legal courts ever accepted this philosophy at all? CC to PhotoForum....Andy has some experience/expertise in this legal context too I believe....;)) -- Bye, Willem-Jan Markerink The desire to understand is sometimes far less intelligent than the inability to understand <w.j.markerink@a1.nl> [note: 'a-one' & 'en-el'!]