21. The computer program product of claim 17 , wherein (A) further comprises identifying a header portion of the original audio signal, and wherein (B) comprises removing the identified header portion from the original audio signal.
17. A computer program product comprising computer program instructions tangibly embodied on a computer-readable medium, wherein the instructions are executable by a computer processor to perform a method comprising: (A) identifying a first portion of an original audio signal, the first portion representing sensitive content, comprising: (A)(1) generating a report, the report comprising: (a) content representing information in the original audio signal, and (b) a timestamp indicating a temporal position of the first portion of the original audio signal; (A)(2) identifying a first personally identifying concept in the report; (A)(3) identifying a first timestamp in the report corresponding to the first personally identifying concept; (A)(4) identifying a portion of the original audio signal corresponding to the first personally identifying concept by using the first timestamp; and (B) producing a modified audio signal in which the identified first portion is protected against unauthorized disclosure by applying a security measure to the identified first portion to produce the modified audio signal, wherein the identified first portion in the modified audio signal is protected against unauthorized disclosure.