DATA TRANSMISSION BY EXTRACTED OR CALCULATED IDENTIFYING DATA

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 from audible portions or video portions of first content utilizing at least a programmed electronic processor housed within the handheld device, in which the handheld device comprises a media player for rendering audio or video content to a user of the handheld device, and the information comprises capabilities associated with the handheld device; with reference to a database, determining additional content, enhanced or improved relative to the first content, that is associated with: i) the identifying data, and ii) the information; and providing metadata associated with the additional content to the handheld device. These techniques could be advantageously applied to cell phones. Of course, other combinations and claims are also provided.