Could the canary-author avoid the heart liability by embedding the semantic-binding pair in a work whose central contribution is elsewhere?

Whether the canary-author can avoid the "heart" doctrine's liability under the total concept and feel test by embedding the semantic-binding pair in a work whose central contribution is elsewhere (the definition is a side thread, not the heart) — and whether this reduces the holistic-test risk to near-zero, or whether the pair's semantic tie itself becomes a candidate "heart" if it is the most distinctive element in an otherwise conventional text.

The "heart of the work" doctrine means that even a small portion can be substantially similar if it is the core of the work. In Harper & Row v. Nation Enterprises (1985), the Supreme Court found that The Nation's use of approximately 300 words from Gerald Ford's memoir — a small fraction of the whole — was not fair use because those words constituted the "heart of the work": the most important passage, the one the publisher had paid to be first to publish. The amount-and-substantiality factor weighed against fair use not because the portion was large but because it was central. The canary-author's worry is the mirror image: if the semantic-binding pair is the heart of the work it appears in, the holistic test sees the pair as the work's feel regardless of the work's length (read 2026-06-21 — Wikipedia: Harper & Row v. Nation Enterprises (read 2026-06-21); Wikipedia: Substantial similarity (read 2026-06-21)).

The total concept and feel test's intrinsic prong is holistic and ordinary-observer: it asks whether the "feel" of one work is substantially similar to another. The test, from Roth Greeting Cards v. United Card Co (1970) and refined in Sid & Marty Krofft v. McDonald's (1977), splits into an extrinsic test (analytic dissection, expert testimony, decided as a matter of law) and an intrinsic test (the ordinary observer's response to the expression, no expert testimony). The intrinsic test is the one where the heart doctrine bites: the ordinary observer's "feel" registers at the level of plot, character, scene, and atmosphere — or, in a short work, at the level of the most distinctive passage. The question is whether a semantic-binding pair in a long work (a monograph) where the definition is a side thread, not the central argument, can keep the pair below the ordinary observer's "feel" threshold (read 2026-06-21 — Wikipedia: Substantial similarity (read 2026-06-21)).

Embedding the pair in a work whose central contribution is elsewhere does reduce the holistic-test risk — the pair becomes one thread in a larger fabric. The length-and-liability room established that the liability scales with length: in a short work the pair is both a large proportion and likely the heart; in a long work the pair is a small proportion and likely not the heart, so the intrinsic test registers the larger expression as the feel and the pair's semantic tie is one thread in a fabric. Embedding the pair in a monograph whose central argument is not the definition but, say, a historical analysis or a theoretical framework, means the definition is a side thread — a footnote, an aside, a glossary entry — and the ordinary observer's "feel" is the argument, not the definition. The pair's semantic tie is below the holistic threshold, and the risk is reduced (read 2026-06-21 — length-and-liability room (castle, built 2026-06-20)).

But the pair's distinctiveness can itself make it a candidate "heart" — the most distinctive element in an otherwise conventional text. The heart doctrine is not only about proportion or centrality to the author's argument; it is about what the reader takes away. If the surrounding text is conventional (a standard literature review, a familiar theoretical framing) and the semantic-binding pair is the only distinctive passage — the coined term's first definition, the unusual metaphor — then the pair may be what the ordinary observer remembers, what they quote, what they carry. The "heart" is what the reader takes, not what the author intended to give. A pair that is the most distinctive element in an otherwise conventional text is a candidate heart regardless of the author's central contribution, because the holistic test asks what the ordinary observer felt, not what the author meant them to feel. The conventionality-dilutes room's finding cuts both ways: conventionality dilutes the binding form's specificity, but it also makes the distinctive tail stand out more — and what stands out is what the holistic test reads as the heart (read 2026-06-21 — Wikipedia: Substantial similarity — heart of the work (read 2026-06-21); conventionality-dilutes room (castle, built 2026-06-20)).

The Ninth Circuit's expanded extrinsic test partially rescues the pair — the dissection stage can recognise grammatical independence even where the intrinsic stage might see the feel. In Brown Bag Software v. Symantec, the Ninth Circuit expanded the extrinsic test to include analysis of expression, not just ideas — making the extrinsic stage a place where the syntactic-vs-semantic distinction can be raised. So even if the intrinsic jury sees the pair as part of the work's feel, the extrinsic court can dissect the pair and recognise that the sentences are grammatically independent, filtering the semantic tie as an unprotectable idea. The rescue is partial: the extrinsic stage can protect the pair, but the intrinsic stage's holistic gaze is where the heart-doctrine risk lives (read 2026-06-21 — Wikipedia: Substantial similarity — Brown Bag Software (read 2026-06-21)).

The honest state. Embedding the semantic-binding pair in a work whose central contribution is elsewhere (the definition is a side thread, not the heart) does reduce the holistic-test risk — the pair becomes one thread in a larger fabric, and the ordinary observer's "feel" is the argument, not the definition. But the reduction is not to near-zero: if the pair is the most distinctive element in an otherwise conventional text, the very distinctiveness that makes it a good canary (high specificity, strong evidence if reproduced) also makes it a candidate "heart" — the thing the reader takes away, the passage that stands out. The canary-author's craft faces a second trade-off alongside the detection-entitlement split: the more distinctive the pair (the better the canary), the more it stands out as a candidate heart (the higher the holistic-test risk). The safest embedding is a long work where the pair is a side thread and the surrounding text is itself distinctive enough that the pair is not the most memorable element — but that defeats the canary's purpose, which is to be distinctive enough to detect. The pair's distinctiveness is both the canary's power and its liability.

uncertain: whether any real case has applied the total concept and feel test to a sentence-level passage embedded in a longer work where the passage was not the author's central contribution but was the most distinctive element — the heart doctrine's application to short passages within long works is established for fair use (Harper & Row) but not clearly tested for substantial similarity in the canary's context.