17. A non-transitory computer-readable storage device having instructions stored which, when executed by a computing device, cause the computing device to perform operations comprising: sanitizing sensitive information found in a transcription from a first speaker, to yield a clean transcription comprising sanitized text and non-sanitized text, wherein a first feature vector associated with the non-sanitized text in the transcription identifies the first speaker; generating a mean feature vector by taking a mean of the first feature vector for the transcription of the first speaker and a second feature vector associated with a second document and which identifies a second speaker, wherein the first speaker and the second speaker are different speakers; and replacing, via a processor of a computing device, the first feature vector associated with the non-sanitized text with the mean feature vector to anonymize the non-sanitized text.
18. The non-transitory computer-readable storage device of claim 17 , wherein sanitizing the sensitive information further comprises: finding a named entity in the transcription; and performing, on the named entity, one of value distortion, value disassociation, and value class membership to preserve privacy in a spoken natural language database.