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docs: no exact tier — the file-hash tier was withdrawn

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A stale reference to 'the runtime/exact tiers' as the fallback for media too
short to carry an audio signature. The exact tier keyed on a file hash and was
withdrawn on legal grounds: it fingerprinted the individual copy a user holds
rather than the cut the timings describe.

The pipeline never emitted a video_hash, so nothing in the code changes — but a
spec that still names a withdrawn tier is what makes the withdrawal look like an
oversight to the next reader, which is exactly how it nearly got re-added.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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dtourolle
2026-07-31 09:55:50 +02:00
co-authored by Claude Opus 5
parent 843852e19c
commit b7c96641a9
1 changed files with 4 additions and 2 deletions
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docs/SPEC.md
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@@ -997,8 +997,10 @@ rewritten.
**Media shorter than 120 s.** The window `runtime/2 ± 60 s` underflows, so no **Media shorter than 120 s.** The window `runtime/2 ± 60 s` underflows, so no
signature is emitted and **no sync offset is applied**. Such items fall back to signature is emitted and **no sync offset is applied**. Such items fall back to
the runtime/exact tiers, which is adequate: a 90-second extra or trailer is not the runtime tier, which is adequate: a 90-second extra or trailer is not the
the content whose cut alignment matters. Both producers must apply the identical content whose cut alignment matters. (There is no `exact` tier: the file-hash
tier was withdrawn on legal grounds — it fingerprinted an individual copy rather
than the cut the timings describe. See the server spec §3.) Both producers must apply the identical
rule, or they diverge on exactly the short items most likely to be rule, or they diverge on exactly the short items most likely to be
mis-identified. mis-identified.