I'd like to be able to take a PDF of a drawing and compare it with another iterration of a PDF of the drawing. It does already work with drawing files, such as TIFF. According to the PTC-support the effort to implement this comparison should be little effort.
This would better support review situations where a markup doesn't show enough information. There're also times when someone might want to sneak something into a drawing upon change that isn't readily caught during that review. This would flag that delta.
I know that it would be difficult to compare PDFs originating from different content such as Office document formats. However, providing this capability for PDFs created from Creo View MCAD would provide a lot of value to the review process.
Even it is mentioned in the Creo View 3.1 it only supports PDF created from PVZ and PVS. There is no regular PDF drawing support.