1. A processor-implemented method of protecting sensitive data in a received transmission, the processor-implemented method comprising: a hardware network interface receiving a data transmission; and a processor identifying sensitive data from the data transmission according to a data set rule, wherein identified sensitive data is part of a set of sensitive data, wherein the data set rule defines currently received data as being sensitive only if a predetermined amount of other data from the set of sensitive data has been previously received, and wherein additional information about a subject of the set of sensitive data can only be obtained by utilizing the identified sensitive data plus the predetermined amount of other data from the set of sensitive data.