The present copyright holders of this program have given permission, as a
special exception, to link this program with the Mozilla XPCOM library,
libxpcom and to include header files for xpcom components when those header
files are covered by the MPL or NPL licenses, as long as the GNU GPL is
followed for this program in all other ways. If at a future time xpcom
and/or used header files are dual-licensed, where one of the licenses is 
the GNU GPL, this exception clause ceases to apply for the dual-licensed
code, and such code must be used under the GNU GPL.