diff --git a/doc/copyright.texi b/doc/copyright.texi
index a371cfec3..56be8e5eb 100644
--- a/doc/copyright.texi
+++ b/doc/copyright.texi
@@ -297,5 +297,23 @@ WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+@end verbatim
+@copynext
+@verbatim
+
+D3DES (V5.09) - 
+
+A portable, public domain, version of the Data Encryption Standard.
+
+Written with Symantec's THINK (Lightspeed) C by Richard Outerbridge.
+Thanks to: Dan Hoey for his excellent Initial and Inverse permutation
+code;  Jim Gillogly & Phil Karn for the DES key schedule code; Dennis
+Ferguson, Eric Young and Dana How for comparing notes; and Ray Lau,
+for humouring me on. 
+
+Copyright (c) 1988,1989,1990,1991,1992 by Richard Outerbridge.
+(GEnie : OUTER; CIS : [71755,204]) Graven Imagery, 1992.
+
+
 @end verbatim
 @copyrightend