Comment by SAI_Peregrinus
5 hours ago
Open-source software provides the four freedoms, but doesn't necessarily require preserving them transitively.
GPL software requires preserving them transitively and requires derivative works using the licensed software as a component to provide them.
MPL requires preserving them transitively.
BSD/Apache/MIT don't require preserving them, but still require the resulting software to include the original license & attribution. In the case of a closed-source program distributing (say) MIT-licensed software with proprietary modifications, the resulting binary is still released partly under the MIT license & includes the MIT license text, but doesn't include the source code.
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