This document specifies the information exchanges between various parties' infrastructures that takeplace in support of DPM applications. It complements standards that address the design, security,applications and readability of Digital Postage Marks.Cross References:ISO 10126-2ISO/IEC 9798-3IEEE P1363-1998ANSI X9.30-1-1997 ANSI X9.31: 1998EN 14615ISO/IEC 10118-3FIPS PUB 180-4ANSI X9.71-2000FIPS PUB 186-4ANSI X9.52-1998ANSI X9.62-1998ANSI X9.44