18. The non-transitory computer-readable medium of claim 17 , wherein the parsing step comprises: comparing a pixel intensity with a content indicator threshold; wherein each value in the content vector is binary; and wherein each value in the content vector reflects a comparison of the pixel intensity with the content indicator threshold performed during the comparing step.
17. A non-transitory computer-readable medium storing instructions for the execution of a method for preventing overlap during the application of a universal identifier to a signature document in an electronic signature service, wherein the method comprises: parsing an image file of the signature document to obtain a content vector, wherein a set of addresses of the content vector uniquely correspond with a set of locations in the image, wherein at least one value in the content vector indicates unexecuted signature document content, and wherein each value in the content vector indicates content at a corresponding location in the image; measuring an overlap quantity for a potential universal identifier location, wherein the measuring uses the content vector to measure the overlap quantity; selecting a universal identifier location in the signature document, wherein the selecting uses the overlap quantity; and applying the universal identifier to the signature document, wherein the applying uses the universal identifier location.