The present invention relates to data transmission, and more particularly relates to use of extracted or calculated identifying data as proxies in transmission. One claim recites a method including: receiving identifying data and information from a handheld device, the identifying data having been calculated...http://www.google.com.hk/patents/US7965864?utm_source=gb-gplus-share專利 US7965864 - Data transmission by extracted or calculated identifying data
