Apparatus and method for a modular postage accounting system. An open system metering device of the present invention includes a general purpose computer, a digital printer and a secure metering device (SMD). The SMD performs the accounting functions of a postage meter and generates encrypted...http://www.google.ca/patents/US5822738?utm_source=gb-gplus-sharePatent US5822738 - Method and apparatus for a modular postage accounting system
