The invention herein is a terminal having secured access to data in a computer where such data is segregated and separately identified, access to the terminal being had by a tubular key rotating discs therein to interrupt a sustained light stream into a blinking code to be read by a counter transmitting the code read to the computer making the same operational to release and make operational the particular programs or data identified therein, all being subject to the operation of the terminal within a prescribed time span.