Real-world race condition! In the same period I remember the copiers in my college library would debit their magstripe cards about 1-2 seconds after the 'copy'

Real-world race condition! In the same period I remember the copiers in my college library would debit their magstripe cards about 1-2 seconds after the 'copy' button was pressed. A frugal / amoral user could easily eject the card, reinsert, copy the next page, eject, reinsert...