diff --git a/examples/line-item-ctv.yaml b/examples/line-item-ctv.yaml
index fda3994..3a68e0d 100644
--- a/examples/line-item-ctv.yaml
+++ b/examples/line-item-ctv.yaml
@@ -33,3 +33,5 @@ buying_route:      SSP_PLATFORM
 transaction_mechanism: { available: ["PRIVATE_AUCTION"], included: ["PRIVATE_AUCTION"] }
 serving_mode:      ssai
 correlation_id:    "ep-q4-2026-commitment/weather-app-ctv"
+
+# Inspecting this line item's VAST creative is subject to spec section 5.4.
diff --git a/spec/CHANGELOG.md b/spec/CHANGELOG.md
index 1dfacef..14a6441 100644
--- a/spec/CHANGELOG.md
+++ b/spec/CHANGELOG.md
@@ -5,6 +5,10 @@ issue that caused it, so the comment record and the spec history line up.
 
 ## [Unreleased]
 
+- Define the boundary between creative inspection and production notifications
+  in section 5.4, with an informative CTV example note
+  ([#42](https://github.com/IABTechLab/OpenProposal/issues/42)).
+
 ## [3.0-draft-1] — 2026-09-22
 
 Initial draft published for public comment. Ported from the working-group
diff --git a/spec/openproposal-3.0.md b/spec/openproposal-3.0.md
index 6940958..027237b 100644
--- a/spec/openproposal-3.0.md
+++ b/spec/openproposal-3.0.md
@@ -248,6 +248,45 @@ channel.
 | `approval` | Object | seller-set | Review SLA and revision policy |
 | `production` | Object | selectable | Custom units. `available[]` of build options with `pricing` and `lead_time`; `{ custom_unit, build_owner, lead_time, cost }` |
 
+#### Creative inspection and previews
+
+For this section, inspection means evaluating a creative outside live campaign
+delivery, including discovery, composition, submission checks and previews. A
+production notification is an event report intended for a campaign's live
+measurement or delivery diagnostics.
+
+An implementation performing inspection MUST NOT send any production
+notification. This includes requesting an event URL solely to check its
+availability, regardless of the HTTP method used.
+
+An implementation MAY retrieve creative documents, follow VAST wrappers and
+inspect referenced media as needed for its checks. Permission to retrieve these
+resources does not extend to firing their event URLs. Retrieval can itself be
+logged by the resource owner; this requirement does not imply that inspection
+produces no server activity.
+
+A landing-page inspection remains subject to the same notification prohibition,
+including any redirect requests. The presence of a URL in VAST `<ClickThrough>`
+does not establish that requesting it is safe for inspection. The inspector
+MUST NOT request a destination or redirect that sends a production notification;
+it MAY use a separate inspection URL or the receiving service's documented test
+mode under the conditions below.
+
+A preview that executes creative or verification code MUST prevent that code
+from sending production notifications. Synthetic events MAY be sent to test
+endpoints, or through a test mode that the receiving service documents as
+excluding those events from production measurement and delivery diagnostics. An
+inspector's own test flag is insufficient unless the receiving service supports
+it.
+
+Inspection failures MUST be reported through diagnostics, without firing a
+production VAST `<Error>` or `verificationNotExecuted` URL. An implementation
+MUST NOT report a check that was skipped or could not finish as passed.
+
+These requirements apply to inspection only. During live delivery,
+implementations remain subject to the tracking and error-reporting requirements
+of the applicable execution standard.
+
 ### 5.5 Targeting envelope
 
 Each field declares bounds, not a value. A bare value means the field is
@@ -371,6 +410,8 @@ buyer commitment, and `settable` bounds. See
 
 See [`examples/line-item-ctv.yaml`](../examples/line-item-ctv.yaml).
 
+Inspecting this line item's VAST creative is subject to section 5.4.
+
 ### 6.4 Audio line item
 
 See [`examples/line-item-audio.yaml`](../examples/line-item-audio.yaml).