There is no annual fee or Site Licence for the CD-Rom. Each CD-Rom is supplied for installation on one computer only and paid for just once. We therefore offer discounted prices for buying two or more, and five or more, for anyone who needs to install on more than one computer. A single CD-Rom can be installed a second time, for legitimate reasons, when a computer has to be replaced or reconfigured. Re-installing does trigger email warnings, so please buy enough CD-Rom for one each per computer.