- Sold under a dual-licence scheme
- Free licence
- freedom to modify and create derivative works
- freedom to distribute without royalties
- one stipulation: all software using Inferno is made available under same terms
- doesn't prevent commercial use but requires you to make public, on request, any IPR created based on Inferno
- Non-Free licence
- negotiated indiviually
- cost depends on intended use and scale of distribution
- IPR can be retained
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