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(n.) A phenomena caused by winding layer upon layer of tape on a reel. This winding causes one layer to magnetize the adjacent layer, thus printing through from one layer onto another layer. It is also sometimes called interlayer transfer or crosstalk. The parts of the magnetic tape most vulnerable lie between program material where blank spots and spaces are adjacent to loud passages. Two other terms are associated with print-through. On layers played back before loud passages a “preecho” is heard, while on layers played back following a loud passage a “post-echo” is heard. Privacy Enhanced Mail (PEM) (n.) An Internet Engineering Task Force (IETF) standard for secure electronic mail exchange.