T-Rex is distributed as shareware. It is not in the "public domain". It is not free software. However, you do have the opportunity to try it for 90 days before you pay for it, so it costs you nothing to try it out.
A developer licence costs US$17.50 per developer workstation (or US$37.50 if you want the source code). Generous site licences are available.
This is a one-off fee: there are no royalties to pay.
The benefits of licensing the components are:
We accept the following forms of payment:
Credit cards: MasterCard and Visa. You will find a credit card authorization
form in the helpfile.
Online registration on
(SWREG 10907 and 10908).
Personal cheque or banker's draft in US dollars (drawn on a US
bank).
Or a personal cheque or Eurocheque in other currencies
(but contact us first for
payment instructions).
Mail the order form that you will find in the helpfile along with your cheque.
Company purchase order for 4 copies (US$70) or more. We will invoice
you in whatever currency your company wishes.
Secure online licensing, and immediate download of the source code, on the
Web, using any credit card, at
Albert's Ambry (with-source option -- US$37.50 -- only).