Hmmm ... just a thought on this problem. It would seem to me possible to write a 'Mover-type program to get around it. Something that would look for the original V2 .CR2 and do some checks like file length, specific code entries and say a CRC check to make certain it wasn't a spoof. The program would only de-code if it could find an original V2 .CR2. Like I said, just a thought.