FastFox requires purchase and registration of a license for each installation of the software.
There are 2 license types available:

1. Personal/Home - a single user license, does not include shared shortcut support.
2. Business - includes the ability to use shared shortcuts with other FastFox users within your network.

You can view current pricing information at http://www.nch.com.au/fastfox/register.

Once you have obtained your registration, select File -> Register Software from the menu, and enter your registration details exactly as provided.