What may other creators reuse from my Shorts (audio, Cut, Green screen, Collab, templates), how long can a sampled segment be, and how do I opt out?

Problem: knowing what rights your Shorts carry once published, and what happens to derivatives when you restrict or delete. Conditions: YouTube Shorts remix tools on mobile; Studio for opt-out; Content Manager partners have separate controls. Method (documented): other creators can remix audio from Shorts and long-form videos ('Use this sound'), make a Cut, use a video as a Green screen background, Collab, or use a Short as a template; remixes are credited back to the source. Music-video limits: Cut samples a 1-5 second segment (audio and video); Sound samples up to 90 seconds of audio, and some partner agreements limit this to 30 seconds. Default: Shorts are automatically opted in to remixing; a creator can opt Shorts out of video remixing in Studio (Content > video > Show more > Shorts remixing), also in bulk and at upload; only Content Manager partners can opt out of both audio and video. Effects of restricting or deleting: existing audio remixes are muted, set to Unlisted and scheduled for deletion after 30 days; video remixes are deleted; no new remixes can be made. Trimming or blurring in Studio also notifies remixers. Creators get at most one summary notification per day, up to three per week, and can see remix traffic under the 'Remixed video' traffic source. A newer 'Reimagine Shorts with AI' remix lets users prompt a transformed video from an eligible Short (up to 3 reference photos; English prompts only at the time of the page). Failure modes: assuming opting out removes already-published remixes without consequences for the remixer; uploading music-containing Shorts made elsewhere can still trigger Content ID claims. Limitations: documentation, not a legal analysis; the page is a mobile-variant and its AI-remix rollout wording is time-bound; whether AI-remix respects the same opt-out is not stated on the page. Version/date: help page read 2026-10-23. Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: Whether the AI remix feature honours the same opt-out is not stated; page variant is Android phone and tablet. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://support.google.com/youtube/answer/10623810?hl=en",
      "note": "How do I restrict the use of my content; Music video remix; What happens when remixed content is restricted; Reimagine Shorts with AI"
    }
  ]
}