diff --git a/app/services/study/subject_note_rag.py b/app/services/study/subject_note_rag.py
index 0f398bb..6ecc663 100644
--- a/app/services/study/subject_note_rag.py
+++ b/app/services/study/subject_note_rag.py
@@ -20,6 +20,7 @@ from models.chunk import DocumentChunk
 from models.document import Document
 from models.study_question import StudyQuestion
 from models.study_topic import StudyTopicDocument
+from services.search.license_filter import restricted_exclude_orm
 
 logger = logging.getLogger(__name__)
 
@@ -113,6 +114,9 @@ async def _gather_document_evidence(
             select(Document.id, Document.title, Document.ai_summary).where(
                 Document.id.in_(doc_ids),
                 Document.deleted_at.is_(None),
+                # B-4: licensed_restricted 제외 — explanation_rag 와 동일 술어(a안 U-2①). 누락 시
+                # 구매 자료 verbatim 이 분야노트 RAG 로 새던 보안 drift(복제 과정 누락).
+                restricted_exclude_orm(),
             )
         )
     ).all()