Everything in the src/, check/, and devel/ directories is covered by the GNU
General Public License, Version 2 or later.  A copy is provided in doc/GPL.

Everyting in the doc/ directory is covered by the GNU Free Documentation
License, Version 1.2 or later.  A copy is provided in doc/FDL.

Files located in the helpers/ directory are subject to the individual licenses
mentioned in each file.