, the nature of this situation is such
that you will not find a written admission from a primary source that
it is going on; I learned it through a personal communication.)</p><p>Some free software licenses have special clauses to combat, or at
least discourage, software patents.  The GNU GPL, for example, contains
this language:</p><pre class="screen">
  7. If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are im