15. At least one non-transitory computer-readable medium having encoded thereon executable instructions which, when executed by at least one processor, cause the at least one processor to perform a method comprising acts of: receiving, via at least one network, adaptation data generated at least in part by performing statistical processing on audio data comprising at least one user utterance; and using the adaptation data to update at least one acoustic model for use in speech recognition processing, wherein the adaptation data is in a format that prevents reconstruction of the audio data.
16. The at least one non-transitory computer-readable medium of claim 15 , wherein the adaptation data is received via the at least one network in an encrypted form.