The distinction between Public Domain and Freeware, as I understand it, is that Freeware software can be modified, or redistributed in part (eg without any readme files) whereas Public Domain software can't - which would make most 'Public Domain' games a distinct entity from 'open source'. Either way, nobody should be making a profit from it, unlike shareware and licenseware. Can 'homebrew' as an umbrella term be applied, making PD / freeware / shareware (and maybe licenseware, though that was exclusively licensed to a few specific PD companies, which perhaps makes it distinct?) potentially all subsets of homebrew?
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