Thanks for asking!
To clarify:
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You’re free to use the sounds in your own creative projects (games, videos, apps, music, etc.), whether those projects are commercial or non-commercial.
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What’s not allowed is redistributing or reselling the sounds as sound assets themselves (e.g., uploading them to a free SFX library, including them in another SFX pack, or selling them as-is).
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For open-source projects, the main concern is that the raw files shouldn’t be redistributed in a way that lets people grab them directly as standalone SFX. If you want to use them in an open-source repo, it’s usually fine as long as you note that the audio is licensed and shouldn’t be extracted/reused outside the project. Some people handle this by keeping the assets in a separate download or adding a license note in the repo.
So in short: Yes, you can use the sounds in your project (even open-source).
My idea behind releasing free SFX libraries is to support developers and give them quality assets to work with — so I absolutely want you to be able to use them in your projects, as long as the sounds themselves aren’t repackaged or redistributed as standalone files.