diff --git a/studio/backend/core/inference/diffusion_krea2.py b/studio/backend/core/inference/diffusion_krea2.py
index 86a1d0413c..2c246e1569 100644
--- a/studio/backend/core/inference/diffusion_krea2.py
+++ b/studio/backend/core/inference/diffusion_krea2.py
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved. See /studio/LICENSE.AGPL-3.0
+
 """Krea 2 pipeline loader: assembles ``Krea2Pipeline`` from per-component loads.
 
 Why not ``Krea2Pipeline.from_pretrained``: the ``krea/Krea-2-Turbo`` repo was exported
diff --git a/studio/backend/core/inference/diffusion_lora.py b/studio/backend/core/inference/diffusion_lora.py
index 5d886cf1bd..bcd296bf2a 100644
--- a/studio/backend/core/inference/diffusion_lora.py
+++ b/studio/backend/core/inference/diffusion_lora.py
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved. See /studio/LICENSE.AGPL-3.0
+
 """Shared LoRA support for the Studio diffusion backends.
 
 Both engines apply LoRA differently -- the native stable-diffusion.cpp CLI selects
diff --git a/studio/backend/tests/test_diffusion_controlnet.py b/studio/backend/tests/test_diffusion_controlnet.py
index d7783c7d35..b8ac050db6 100644
--- a/studio/backend/tests/test_diffusion_controlnet.py
+++ b/studio/backend/tests/test_diffusion_controlnet.py
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved. See /studio/LICENSE.AGPL-3.0
+
 """Tests for diffusion ControlNet support: discovery/resolve/preprocess/gate helpers, the
 request-model validation, the family wiring, and the diffusers ControlNet pipe manager."""
 
diff --git a/studio/backend/tests/test_diffusion_krea2.py b/studio/backend/tests/test_diffusion_krea2.py
index 86ff8fdcb0..74556e2179 100644
--- a/studio/backend/tests/test_diffusion_krea2.py
+++ b/studio/backend/tests/test_diffusion_krea2.py
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved. See /studio/LICENSE.AGPL-3.0
+
 """Unit tests for the Krea 2 per-component pipeline loader (CPU-only, no network)."""
 
 from __future__ import annotations
diff --git a/studio/backend/tests/test_diffusion_lora.py b/studio/backend/tests/test_diffusion_lora.py
index 6b1a980e7f..fb5c2d1f6c 100644
--- a/studio/backend/tests/test_diffusion_lora.py
+++ b/studio/backend/tests/test_diffusion_lora.py
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved. See /studio/LICENSE.AGPL-3.0
+
 """Tests for diffusion LoRA support: the shared helpers, request-model validation, the
 native prompt-tag/dir wiring, and the diffusers set_adapters manager."""