Ruby In Steel’s Simple, Straightforward License

If you wish to install the software onto more than one computer, you may do so. If a second person wishes to use the software, however, then you need to buy a second license. For the full terms, including all the legal jargon, please download the License document PDF.

 Upgrades, are straightforward too: buy any version 2.x of the software and you will be have access to free updates to all other 2.x versions of the edition which you have purchased.