the term ``modify'' and ``based on'' throughout the license.  GPLv2's ``work

based on the Program'' definition made use of a legal term of art,

``derivative work'', which is peculiar to USA copyright law.  However,

``work based on the Program'' definition historically came not primarily from

readers outside the USA, but from those within it\footnote{The FSF noted in

  that it did not generally agree with these views, and expressed puzzlement

Thus, propagation is defined by behavior, and not by categories drawn from

some particular national copyright statute.  This helps not only with

internationalization, but also factually-based terminology aids in

\subsection{Convey}