With the exception of use at the University of Florida or the U.S. Federal Government, GPOPS-II is commercial software and is available by payment of the appropriate licensing fee. The licensing fee depends upon your institutional affiliation. The various first-time-purchase and upgrade licenses shown below are valid for a period of one year from the time of purchase. Any upgrades made to the software during the licensing period are available at no charge and notifications of such upgrades will be provided by e-mail (along with a link to download the upgrade). Full-featured 30-day trial licenses are available by registering at http://www.gpops2.com/Register/Register.php. Please note that trial licenses are avaiable for only one 30-day period.