Except for the DES library, MD2 and MD5 code, the PKCS#11 headers, and
linux/net/ipsec/radij.c this software is under the GNU Public License,
see the file COPYING.

See the file CREDITS for details on origins of more of the code. 

The DES library is under a BSD style license, see
src/libcrypto/libdes/COPYRIGHT.
Note that this software has a advertising clause in it. 

The MD2 implementation is from RSA Data Security Inc., so this package must
include the following phrase: "RSA Data Security, Inc. MD2 Message Digest
Algorithm"  It is not under the GPL; see details in src/pluto/md2.c.

The MD5 implementation is from RSA Data Security Inc., so this package must
include the following phrase: "derived from the RSA Data Security, Inc.
MD5 Message-Digest Algorithm".  It is not under the GPL; see details in
src/pluto/md5.c

The PKCS#11 header files in programs/pluto/rsaref/ are from RSA Security Inc.,
so they must include the following phrase: "RSA Security Inc. PKCS#11
Cryptographic Token Interface (Cryptoki)". The headers are not under the GPL;
see details in src/pluto/rsaref/pkcs11.h.

In addition to the terms set out under the GPL, permission is granted to
link the software against the libdes, MD2, and MD5 libraries just mentioned.