If by site license you refer to enterprise, then yes, the software offers the possibility to acquire it as an Enterprise license. However, there is no public information about this and you'll have to get in touch with the developers. In fact, the only way to acquire this license is through contact. When you click Enterprise License, the page redirects to a contact form.
Use the following link to reach the page: http://www.trancite.com/enterprise.php?regarding=2