Did you know that every printer in the world has it's own unique signature when it prints. Basically the FBI can tell specifically which printer printed a doc and then trace back purchase records to the owner.
Doom knew this. It was not always so; I cannot remember what year it started, perhaps around the early 2000s. If you have an older printer/copier your documents will have no traceable digital signature or IP address.
In a similar vein, look very closely at the checks in your checkbook. You may notice that the line on which you sign your name looks a little different from other lines on the check. The reason is because it is not simply a line. The line was made with something called "micro fine printing." That line is actually text/numbers that you cannot see without magnifying equipment. To your naked eye it merely looks like a line. Bah!
