Algebridge Directory

Copyright & DMCA

Last updated 13 August 2026

Draft for review. This policy is complete in substance but still needs four details confirmed before launch: the operating legal entity, the governing jurisdiction, a monitored contact address, and a named DMCA agent. They are listed in the project README.

This page explains what we own, what we do not, and how a creator or rights holder can have material removed.

Videos are embedded, not hosted

Every video in the Directory is embedded from YouTube using YouTube's standard, publicly available embed player. This means:

  • We do not host any video file. Nothing is uploaded to, copied onto or stored on our servers.
  • We do not modify, re-encode, crop, re-upload or strip branding from any video.
  • We do not monetise embedded videos and run no advertising anywhere on the Directory. Any advertising you see inside a player is served by YouTube, and the revenue relationship is between YouTube and the creator, exactly as it would be on YouTube itself.
  • Every embed names the channel and links to the original video on YouTube.
  • Playback statistics accrue to the creator's own YouTube analytics, as with any embed.

Videos are selected by searching YouTube, filtering to a short list of established mathematics education channels, and then verifying programmatically that each video is public and that its creator has left embedding enabled. A creator who disables embedding removes the video from this site automatically, because the player will no longer load it.

Creator requests

If you are a creator or rights holder and you would prefer your video not to appear here, we will remove the embed. You do not need to file a formal notice, hire a lawyer or explain your reasoning. Send the video URL and a note that you want it removed, and we will take it out at the next build and confirm to you. We would rather lose an embed than keep one that is unwelcome.

Formal DMCA notice

If you prefer to proceed formally under the Digital Millennium Copyright Act, send a written notice containing:

  1. A physical or electronic signature of the copyright owner or a person authorised to act on their behalf.
  2. Identification of the copyrighted work claimed to have been infringed.
  3. Identification of the material claimed to be infringing, with enough detail for us to locate it — the page URL on this site is ideal.
  4. Your contact information, including address, telephone number and email address.
  5. A statement that you have a good-faith belief that the use is not authorised by the copyright owner, its agent or the law.
  6. A statement, made under penalty of perjury, that the information in the notice is accurate and that you are the owner or authorised to act on the owner's behalf.

Send it through the details on the Contact page. A designated DMCA agent is being registered and will be named here; until that is complete, notices sent to the contact address will be actioned on receipt.

Counter-notices may be submitted by the same route, and should include the elements set out in 17 U.S.C. § 512(g)(3).

Our own content

The written explanations, worked examples, mistake lists, code and design are our original work. If you believe any of that text infringes your rights, use the same contact route and we will investigate promptly and remove anything that should not be there.

Attribution

Underlying mathematical facts are not copyrightable and belong to no one. The explanations here are written independently rather than adapted from any textbook. Where a named theorem, rule or mnemonic has a conventional attribution, it is named in the text.