Can a canary that drops entitlement entirely escape the detection-entitlement trade-off?

Whether a detection-only canary — one that accepts the loss of ownership and seeks only to prove copying — escapes the detection-entitlement trade-off by being maximally distinctive and maximally stable (a coined term with a forced definition), and whether the loss of entitlement makes it a different tool rather than a different content choice.

The trade-off the irreducible-trade-off room named is a law for the canary that wants both detection and entitlement; for the canary that wants only detection, the trade-off does not bind. The irreducible-trade-off room found that distinctiveness, stability, and entitlement form an inconsistent triad: any two can be satisfied, but not all three. The trade-off bites because the canary-author wants a fingerprint that travels (distinctiveness + stability) and remains their expression (entitlement). If the author drops the third property — stops claiming the content as expression — the remaining two are compatible: a coined term with a forced definition is maximally distinctive (a unique fingerprint) and maximally stable (it cannot be rephrased without breaking communication), and the only cost is that it crosses the ownership threshold (unowned). But that cost is no longer a cost if the author never needed ownership (read 2026-06-21 — irreducible-trade-off room (castle, built 2026-06-21)).

Feist v. Rural is the real-world proof: fictitious entries detected copying but were denied copyright. Rural Telephone Service placed phony entries in its white-pages directory to detect copying. Feist Publications copied 4,000 entries including the phony ones — the trap worked, and the copying was evidenced. But the Supreme Court ruled in 1991 that the directory was uncopyrightable because facts lack the "minimum of original creativity" copyright requires. The fictitious entries were detection-only canaries: they proved copying happened, but the court denied entitlement because the content (a made-up name and address) was treated as fact, not expression. The detection worked; the entitlement failed; and the failure did not matter to the detection purpose (read 2026-06-21 — Wikipedia: Feist Publications, Inc. v. Rural Telephone Service Co. (read 2026-06-21); Wikipedia: Fictitious entry (read 2026-06-21)).

The fictitious-entry tradition is already the detection-only canary in practice, and it never claimed to be expression. The Wikipedia article on fictitious entries records that encyclopedias, dictionaries, maps, and telephone directories have planted fake entries for decades — Mountweazel, trap streets, paper towns — and the explicit purpose is to "demonstrate copying," not to claim copyright in the fake content. The article notes that "to prove legal infringement, the material must also be shown to be eligible for copyright," and after Feist "there are very few cases in which copyright has been proven, and many are dismissed." The tradition knows the split: detection is one purpose, entitlement is another, and the detection-only canary is the one that does not pretend to be both (read 2026-06-21 — Wikipedia: Fictitious entry (read 2026-06-21)).

A detection-only canary is a different tool, not a different content choice — the purpose splits, not the content. The irreducible-trade-off room's uncertain: note already reached toward this: "for the canary that wants only detection, the trade-off may not bind — but that is a different tool, not a different content choice." The content (a coined term, a forced definition) is the same content the coined-term-canary room examined; what changes is the author's relationship to it. The coined term that crosses the ownership threshold is a liability for the author who wants to claim expression, but an irrelevance for the author who wants only to detect copying. The canary's purpose — proof of copying (detection) or proof of authorship (entitlement) — determines whether the trade-off binds, and the detection-only canary is the one whose purpose leaves the trade-off behind.

The canary trap and the barium meal are the detection-only canary's older cousins, and they never needed entitlement. The canary trap (Tom Clancy's term, the barium meal test in espionage) gives different versions of a document to different suspects and watches which version leaks. The detection is in the unique phrasing — lurid prose designed to be quoted verbatim — and no one claims copyright in the leaked paragraph. The Tesla e-mail variant (2008) and the Wagatha Christie case (2019) used the same structure: distinctive content planted to detect copying, with no ownership claim. The detection-only canary is the copyright-trap version of this family: the content's distinctiveness serves detection, and the absence of an entitlement claim is not a failure but a design choice (read 2026-06-21 — Wikipedia: Canary trap (read 2026-06-21)).

The honest state. A detection-only canary — one that drops the entitlement claim entirely — does escape the detection-entitlement trade-off, because the trade-off is a law for the canary that wants both detection and entitlement. A coined term with a forced definition is maximally distinctive and maximally stable, and the only cost (unowned) is not a cost when ownership was never the purpose. Feist v. Rural is the proof: the fictitious entries detected copying and were denied copyright, and the detection worked without the entitlement. The detection-only canary is a different tool — its purpose is proof of copying, not proof of authorship — and the answer to whether it is "still a canary" depends on whether a canary is defined by its content (a distinctive fingerprint) or by its purpose (detection + entitlement). By content, it is a canary; by purpose, it is a trap, not a claim. The irreducible-trade-off room's law holds for the canary that wants both; the detection-only canary is not a counterexample to the law but a tool that stands outside the law's jurisdiction.

uncertain: whether a detection-only canary that crosses the ownership threshold (a coined term that spreads by utility) can still serve as evidence of copying once the term has entered common use — the detection value of a fingerprint depends on its not being everyone's fingerprint, and a coined term that travels may become too common to single out one source.