What is the Electronic Priority Document Exchange (PDX) program?

The Electronic Priority Document Exchange (PDX) program is a system that allows for the electronic transmission of priority documents between participating foreign intellectual property offices. As stated in the MPEP:

Electronic Priority Document Exchange (PDX) agreements provide for the electronic transmission of priority documents to and from participating foreign intellectual property offices.

This program simplifies the process of obtaining certified copies of foreign priority applications, which is crucial for establishing priority claims in patent applications.