There must be a host of legitimate uses for the same data. The obvious ones: 1) Verifiy or correct the date/timestamps on recordings. 2) Geo-locate based on

There must be a host of legitimate uses for the same data. The obvious ones: 1) Verifiy or correct the date/timestamps on recordings. 2) Geo-locate based on hum signature. Could apply to recordings or "live" conversations (e.g. skype). 3) Synchronising recordings.