Exercise 3: Why a Full Lyric Lesson Is Riskier Than a Vocabulary Extraction — Possible Solution
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WHAT RIGHTS EACH USE IMPLICATES
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Per this chapter, a full line-by-line lesson implicates two of Chapter
3's exclusive rights at once: reproduction of the original lyrics, and
the derivative-works right, since "a translation is itself a
derivative work." A vocabulary-only extraction, by contrast, per this
chapter, arguably doesn't even reach protectable expression in the
first place, since "individual words alone are not protectable
expression," tying back to Chapter 1's own short-phrases exclusion.

FACTOR-BY-FACTOR: THE FULL LESSON
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Per this chapter's own walkthrough: Factor 1 is "genuinely uncertain"
since an educational purpose doesn't automatically mean transformative
use, especially where the lesson mostly reproduces the lyrics for
consumption rather than commenting on them. Factor 2 weighs against
it (song lyrics are highly creative expression). Factor 3 weighs
"heavily against it," since the lesson uses "effectively the entire
work, not a limited excerpt." That's two factors clearly against the
use and one genuinely uncertain - not a comfortable position.

FACTOR-BY-FACTOR: THE VOCABULARY EXTRACTION
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Per this chapter, Factor 3 "favors this use strongly" since an isolated
word list uses "none of the song's own creative arrangement, none of
its 'heart' in the Harper & Row sense." Combined with the Chapter 1
argument that individual words may not be protectable expression at
all, the vocabulary extraction has a meaningfully stronger position on
the factor (amount/nature of what's taken) that was weakest for the
full lesson.

WHY THIS MAKES THE FULL LESSON THE RISKIER ARGUMENT
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The full lesson accumulates unfavorable or uncertain findings across
Factors 1 through 3 simultaneously, with no factor clearly and
strongly favoring it - exactly the kind of borderline, multi-factor
uncertainty Chapter 4's own central warning cautions against relying
on. The vocabulary extraction, by contrast, has a strong argument on
the factor most directly tied to how much protectable material was
actually used, and a plausible argument that it doesn't reach
protectable expression at all. This is precisely why L7 requires
copyright-clear lyrics for the full lesson format but treats the
vocabulary format as safe regardless of the source song's copyright
status - the underlying legal risk profile of the two formats is
genuinely different, not just a stylistic house rule.

WHY THIS WORKS AS AN ANSWER
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It walks through this chapter's own factor-by-factor analysis for both
use types side by side, identifies specifically which factors differ
and why, and connects the difference in legal risk directly back to
why L7 itself draws its line exactly where it does rather than
treating the rule as an arbitrary house policy.