Security Innovation NTRU cryptographic software invention and reference source code including NTRUCrypt and NTRUSign/PASS is a dual license product and includes open source and standard commercial licensing.
NTRU cryptographic IP and reference software may be used and modified to the needs of the user as long as the user adheres to version three of the GPL License. For details pleas refer to COPYING.md included in this distribution. The GPLv3 license may also be found on the gnu.org website (https://gnu.org/licenses/gpl.html).
Businesses and enterprises that wish to incorporate NTRU cryptography into proprietary appliances or other commercial software products for re-distribution must have a commercial license. Commercial licenses are available using flexible licensing terms on a one time per product fee or running royalty. For details please refer to COMMERCIAL LICENSE.doc included in this distribution. The commercial license may also be found at the security Innovation website (http://www.securityinnovation.com/NTRUlicense.doc)