1. A method of automatically identifying relevant data during a digital forensic investigation, the method comprising: extracting raw data from one or more digital data sources, thereby producing extracted unknown raw data; determining which ones of a plurality of one or more identification modules, the unknown raw data should be delivered to for processing wherein the determination is based on categories of data comprising the extracted unknown raw data; within the determined ones of the identification modules, any relevant data in the extracted unknown raw data, wherein relevant data are one of data identical to and similar to the extracted unknown raw data; and transmitting a signal if there is any suspect data, whereby relevant data are identified are automatically, without intervention by a human being.