#Fair Use & Non-Substitutive Use Policy

Purpose: Eko exists to detect and interpret change, not to reproduce or replace source content. This policy defines how summaries are produced to remain fair-use safe and non-substitutive.

#Core Principles

• Transformative: Outputs abstract, label, and interpret deltas.
• Non‑replacement: Users must still visit the source to consume content.
• Minimal quoting: Avoid verbatim text; never reconstruct pages.
• Publisher intent: Respect access controls, paywalls, and robots signals.

#Allowed

• High‑level summaries of what changed.
• Structural diffs (added/removed sections, reordered items).
• Interpreted impact and confidence labeling.

#Prohibited

• Large quotations or full sections.
• Page reconstruction or screenshots of protected content.
• Guessing hidden or paywalled text.

#Safeguards

• Section hashing & delta‑first rendering.
• Output length caps.
• Confidence downgrades when ambiguity exists.

#Enforcement

Violations trigger summary truncation or suppression. Repeat violations require prompt updates or code fixes.