Z:gnu-www-ja-patent-reform-is-not-enough--9ac8a0-When people first learn about/en

When people first learn about the problem of software patents, their attention is often drawn to the egregious examples: patents that cover techniques already widely known. These techniques include sorting a collection of formulae so that no variable is used before it is calculated (called &ldquo;natural order recalculation&rdquo; in spreadsheets), and the use of exclusive-or to modify the contents of a bit-map display.