I didn't say there is a single number, I said they all share a similar mthematical property: when processed by there respective algorithms, then processed agai

I didn't say there is a single number, I said they all share a similar mthematical property: when processed by there respective algorithms, then processed again by another complex algorithm (you), they are seen to be related. If we have a lossy encoding so poor that you can no longer recognize it, then I'm fine with saying it is "no longer that movie".