A system and method that records a message and then delivers the message to one or more recipients. A polylactic acid based resin according to the present invention is characterized by having a specific structural moiety and a weight average molecular weight of 5,000 to 1,000,000. The oxidation marks are typically random and irregular, providing a means for pattern tracking using imaging technologies. No or very weak electric field is applied to these offset regions from the gate electrode. The strongest PN is used as the time reference and tau is corrected for. The challenge items are intended for use in a computing system that discriminates between humans and text to speech system.