Abstract: A document which may be a security document has a thermochromic coating which may be a thermochromic ink on the substrate of the document. The ink may include several thermochromic materials which transition from various different colors to substantially clear in appearance as the ink is warmed to various temperatures. The combination of the colors of the thermochromic materials can give the document a different color at a number of different temperatures, until the coating is warmed to the highest color change point. When at or above the highest color change temperature, the coating becomes substantially transparent and the printed area assumes the color of the underlying substrate. The coating may also include non-reactive materials of yet another color that mixes with the colors of the thermochromic materials.

Abstract: A method of signature capture for a document uses a portable digital media device with a touch responsive screen on which the signer traces his signature. An URL address is sent to the device and opened in the web browser. The URL address is valid for a limited period of time, and the signature is stored at a webpage associated with the URL address.