GNU Crypto - GNU Project - Free Software Foundation (FSF)

GNU Crypto - GNU Project - Free Software Foundation (FSF): "GNU Crypto, part of the GNU project, released under the aegis of GNU, aims at providing free, versatile, high-quality, and provably correct implementations of cryptographic primitives and tools in the Java programming language for use by programmers and end-users.

GNU Crypto is licensed under the terms of the GNU General Public License, with the 'library exception' which permits its use as a library in conjunction with non-Free software:

'As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.'"