What are some potential risks of ‘patent treachery’ or the ‘MIT license’?
‘The disadvantage is that anyone can take software licensed under MIT, change the branding, and sell it as proprietary software. Commercializing software released under an MIT license is more challenging. A common business model involves licensing the software as open-source, and offering proprietary extensions built on top of that software.
Furthermore, MIT licenses don’t explicitly include a patent license grant. This means anyone who copies, uses, or distributes the software might become liable for patent infringement if the creator or contributor patented certain components. It is uncertain whether the law would imply a patent license, if the creator of the software were to sue a user for patent infringement.’
are there risks associated with ‘copyleft’ licensing?
‘but while understanding the differences between permissive licenses is important, far more important is drawing the line between them and their unfriendly counterparts, copyleft. As a user of open source components, copyleft licenses can “infect” your entire code base and impose restrictions that might prevent you from commercializing. As a developer of open source software, copyleft can significantly limit the appeal and adoption of your components.’
copyleft is described by this author using the metaphor of disease.