“Door closing” explains a sound, but it says nothing about whether you may use that particular recording. Keep the source and permission information with the file before it enters an edit.
For each imported effect, record where it came from, when you obtained it and the relevant licence or written permission. Retain the exact terms or a reliable reference. Do not assume that “free download” means unrestricted publication.
Separate recordings you made yourself from third-party material, while remembering that your own recording can still contain other people’s voices or protected material. Check the actual circumstances rather than treating authorship as the only question.
Use a small index linking the working filename to its source record. This keeps an editor from losing the provenance when a long download name is shortened for the timeline.
Before delivery, review the effects actually used, not every file in the project folder. Confirm any attribution requirements in the applicable terms and place credits where required. Seek appropriate advice if the permission remains unclear.
This workflow does not interpret every licence. It makes the evidence available so publication decisions are based on the recording’s real conditions, instead of a filename or an assumption made weeks earlier.
Editorial illustration from the site’s image collection.