A BY-NC source sound cannot be re-released under CC0 or CC-BY — only BY-NC output is permitted

When a creator remixes or builds upon a Freesound sound to produce a new sound, the output license is constrained by the input license — a form of the Creative Commons share-alike logic. A CC0 source allows the derivative to be released under any license including CC0, BY, or BY-NC. A CC-BY source allows BY or BY-NC output but not CC0 (because stripping attribution is prohibited). A CC-BY-NC source can only produce BY-NC output — it cannot be liberalized to CC0 or CC-BY. Attribution chains propagate: if B remixes A’s BY sound and publishes as BY, then C using B’s sound must credit both A and B. This cascade logic makes it important to trace the license of every input before choosing the output license of a remixed or composite sound.

Examples

User A has a CC-BY loop. User B layers it with her own recording and wants to release as CC0. This is not permitted. She must release as CC-BY (or CC-BY-NC) and credit A.

Assessment

Given a table row: input sound is CC-BY-NC, desired output license is CC-BY. Can the remix be published this way? Explain why and state what license the output must carry instead.