All About the Paper -- Dickeson

There are two forms of RFID: read only and read/write. Both are tags that can be affixed to a physical object. Both can be remotely "read" by a radio receiver tuned to their frequency, but the information on the read/write tags can be remotely edited or modified by a radio transmitter/receiver.

That ability to modify the data by high speed, and the re-usability of the tags, is what makes them particularly appealing to the idea of "following the paper" in printing. Data on those tags can tell us much about the paper used for the printing of a form or job.