diff --git a/docs/conf.py b/docs/conf.py
index b1fdd21..ff0390a 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 # Configuration file for the Sphinx documentation builder.
 #
 # This file only contains a selection of the most common options. For a full
diff --git a/setup.py b/setup.py
index 21a925d..8d78d74 100644
--- a/setup.py
+++ b/setup.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from setuptools import setup, find_packages
 import os 
 
@@ -10,11 +24,13 @@
 
 setup(name         = "layoutparser",
       version      = __version__,
-      author       = "Zejiang Shen Ruochen Zhang",
+      author       = "Zejiang Shen, Ruochen Zhang, and Layout Parser Model Contributors",
+      author_email = "layoutparser@gmail.com",
       license      = "Apache-2.0",
       url          = "https://github.com/Layout-Parser/layout-parser",
       package_dir  = {"": "src"},
       packages     = find_packages("src"),
+      description  = "A unified toolkit for Deep Learning Based Document Image Analysis",
       long_description=open("README.md", "r", encoding="utf-8").read(),
       long_description_content_type="text/markdown",
       python_requires='>=3.6',
diff --git a/src/layoutparser/__init__.py b/src/layoutparser/__init__.py
index 437eb7a..e587375 100644
--- a/src/layoutparser/__init__.py
+++ b/src/layoutparser/__init__.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 __version__ = "0.2.0"
 
 import sys
diff --git a/src/layoutparser/elements/__init__.py b/src/layoutparser/elements/__init__.py
index c32b6b2..6df51d2 100644
--- a/src/layoutparser/elements/__init__.py
+++ b/src/layoutparser/elements/__init__.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from .base import BaseCoordElement, BaseLayoutElement
 from .layout_elements import (
     Interval,
diff --git a/src/layoutparser/elements/base.py b/src/layoutparser/elements/base.py
index 88916c0..c78cd71 100644
--- a/src/layoutparser/elements/base.py
+++ b/src/layoutparser/elements/base.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from typing import List, Dict, Dict, Any
 from abc import ABC, abstractmethod
 from copy import copy
diff --git a/src/layoutparser/elements/errors.py b/src/layoutparser/elements/errors.py
index 914ffbc..c5ef31d 100644
--- a/src/layoutparser/elements/errors.py
+++ b/src/layoutparser/elements/errors.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 class NotSupportedShapeError(Exception):
     """For now (v0.2), if the created shape might be a polygon (shapes with more than 4 vertices),
     layoutparser will raise NotSupportedShapeError. It is expected to be fixed in the future versions.
diff --git a/src/layoutparser/elements/layout.py b/src/layoutparser/elements/layout.py
index b03b15c..174858c 100644
--- a/src/layoutparser/elements/layout.py
+++ b/src/layoutparser/elements/layout.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout sParser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from typing import List, Union, Dict, Dict, Any, Optional
 from collections.abc import MutableSequence
 from copy import copy
diff --git a/src/layoutparser/elements/layout_elements.py b/src/layoutparser/elements/layout_elements.py
index 922229c..5bbe5b6 100644
--- a/src/layoutparser/elements/layout_elements.py
+++ b/src/layoutparser/elements/layout_elements.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from typing import List, Union, Dict, Dict, Any, Optional, Tuple
 from collections.abc import Iterable
 from copy import copy
diff --git a/src/layoutparser/elements/utils.py b/src/layoutparser/elements/utils.py
index 46ce052..a6676a2 100644
--- a/src/layoutparser/elements/utils.py
+++ b/src/layoutparser/elements/utils.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from typing import List, Union, Dict, Dict, Any, Optional, Tuple
 
 import numpy as np
diff --git a/src/layoutparser/file_utils.py b/src/layoutparser/file_utils.py
index d1568bb..b10a747 100644
--- a/src/layoutparser/file_utils.py
+++ b/src/layoutparser/file_utils.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 # Some code are adapted from
 # https://github.com/huggingface/transformers/blob/master/src/transformers/file_utils.py
 
diff --git a/src/layoutparser/io.py b/src/layoutparser/io.py
index fad13b7..d823afb 100644
--- a/src/layoutparser/io.py
+++ b/src/layoutparser/io.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import ast
 import json
 from typing import List, Union, Dict, Dict, Any
diff --git a/src/layoutparser/models/__init__.py b/src/layoutparser/models/__init__.py
index d636c5c..5a92e09 100644
--- a/src/layoutparser/models/__init__.py
+++ b/src/layoutparser/models/__init__.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from .detectron2.layoutmodel import Detectron2LayoutModel
 from .paddledetection.layoutmodel import PaddleDetectionLayoutModel
 from .effdet.layoutmodel import EfficientDetLayoutModel
diff --git a/src/layoutparser/models/auto_layoutmodel.py b/src/layoutparser/models/auto_layoutmodel.py
index 9e5fa59..3c35d99 100644
--- a/src/layoutparser/models/auto_layoutmodel.py
+++ b/src/layoutparser/models/auto_layoutmodel.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from typing import Optional, Dict, Union, List
 from .detectron2.layoutmodel import Detectron2LayoutModel
 from .paddledetection.layoutmodel import PaddleDetectionLayoutModel
diff --git a/src/layoutparser/models/base_catalog.py b/src/layoutparser/models/base_catalog.py
index 3eb6ba5..104d014 100644
--- a/src/layoutparser/models/base_catalog.py
+++ b/src/layoutparser/models/base_catalog.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from iopath.common.file_io import HTTPURLHandler
 from iopath.common.file_io import PathManager as PathManagerBase
 
diff --git a/src/layoutparser/models/base_layoutmodel.py b/src/layoutparser/models/base_layoutmodel.py
index 95883b3..495f34b 100644
--- a/src/layoutparser/models/base_layoutmodel.py
+++ b/src/layoutparser/models/base_layoutmodel.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from typing import Optional, Tuple, Union, Dict
 from abc import ABC, abstractmethod
 
diff --git a/src/layoutparser/models/detectron2/__init__.py b/src/layoutparser/models/detectron2/__init__.py
index d7f1d60..eeb1839 100644
--- a/src/layoutparser/models/detectron2/__init__.py
+++ b/src/layoutparser/models/detectron2/__init__.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from . import catalog as _UNUSED
 # A trick learned from
 # https://github.com/facebookresearch/detectron2/blob/62cf3a2b6840734d2717abdf96e2dd57ed6612a6/detectron2/checkpoint/__init__.py#L6
diff --git a/src/layoutparser/models/detectron2/catalog.py b/src/layoutparser/models/detectron2/catalog.py
index 6e4feb1..12566b6 100644
--- a/src/layoutparser/models/detectron2/catalog.py
+++ b/src/layoutparser/models/detectron2/catalog.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from iopath.common.file_io import PathHandler
 
 from ..base_catalog import PathManager
diff --git a/src/layoutparser/models/detectron2/layoutmodel.py b/src/layoutparser/models/detectron2/layoutmodel.py
index 5ffbd12..8552c56 100644
--- a/src/layoutparser/models/detectron2/layoutmodel.py
+++ b/src/layoutparser/models/detectron2/layoutmodel.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from typing import Union
 from PIL import Image
 import numpy as np
diff --git a/src/layoutparser/models/effdet/__init__.py b/src/layoutparser/models/effdet/__init__.py
index 6e78d19..211f474 100644
--- a/src/layoutparser/models/effdet/__init__.py
+++ b/src/layoutparser/models/effdet/__init__.py
@@ -1,2 +1,16 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from . import catalog as _UNUSED
 from .layoutmodel import EfficientDetLayoutModel
diff --git a/src/layoutparser/models/effdet/catalog.py b/src/layoutparser/models/effdet/catalog.py
index 74e2da1..d530cb3 100644
--- a/src/layoutparser/models/effdet/catalog.py
+++ b/src/layoutparser/models/effdet/catalog.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from iopath.common.file_io import PathHandler
 
 from ..base_catalog import PathManager
diff --git a/src/layoutparser/models/effdet/layoutmodel.py b/src/layoutparser/models/effdet/layoutmodel.py
index b260598..8f25f6b 100644
--- a/src/layoutparser/models/effdet/layoutmodel.py
+++ b/src/layoutparser/models/effdet/layoutmodel.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from typing import List, Optional, Union, Dict, Any, Tuple
 
 from PIL import Image
diff --git a/src/layoutparser/models/model_config.py b/src/layoutparser/models/model_config.py
index 82a98b6..03f0c1d 100644
--- a/src/layoutparser/models/model_config.py
+++ b/src/layoutparser/models/model_config.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 """
 Inside layoutparser, we support the following formats for specifying layout model configs 
 or weights:
diff --git a/src/layoutparser/models/paddledetection/__init__.py b/src/layoutparser/models/paddledetection/__init__.py
index 48b3ede..629619e 100644
--- a/src/layoutparser/models/paddledetection/__init__.py
+++ b/src/layoutparser/models/paddledetection/__init__.py
@@ -1,2 +1,17 @@
+# Copyright 2021 The Layout Parser team and Paddle Detection model 
+# contributors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from . import catalog as _UNUSED
 from .layoutmodel import PaddleDetectionLayoutModel
diff --git a/src/layoutparser/models/paddledetection/catalog.py b/src/layoutparser/models/paddledetection/catalog.py
index 6c738c8..b115850 100644
--- a/src/layoutparser/models/paddledetection/catalog.py
+++ b/src/layoutparser/models/paddledetection/catalog.py
@@ -1,3 +1,18 @@
+# Copyright 2021 The Layout Parser team and Paddle Detection model 
+# contributors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import os
 import logging
 from typing import Any, Optional
diff --git a/src/layoutparser/models/paddledetection/layoutmodel.py b/src/layoutparser/models/paddledetection/layoutmodel.py
index 82f15cd..f4edc33 100644
--- a/src/layoutparser/models/paddledetection/layoutmodel.py
+++ b/src/layoutparser/models/paddledetection/layoutmodel.py
@@ -1,3 +1,18 @@
+# Copyright 2021 The Layout Parser team and Paddle Detection model 
+# contributors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from typing import List, Union, Dict, Any, Tuple
 import os
 from functools import reduce
diff --git a/src/layoutparser/ocr/__init__.py b/src/layoutparser/ocr/__init__.py
index 4a45839..66efd76 100644
--- a/src/layoutparser/ocr/__init__.py
+++ b/src/layoutparser/ocr/__init__.py
@@ -1,2 +1,16 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from .gcv_agent import GCVAgent, GCVFeatureType
 from .tesseract_agent import TesseractAgent, TesseractFeatureType
\ No newline at end of file
diff --git a/src/layoutparser/ocr/base.py b/src/layoutparser/ocr/base.py
index 85b8dc5..4528d28 100644
--- a/src/layoutparser/ocr/base.py
+++ b/src/layoutparser/ocr/base.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from abc import ABC, abstractmethod
 from enum import IntEnum
 
diff --git a/src/layoutparser/ocr/gcv_agent.py b/src/layoutparser/ocr/gcv_agent.py
index 82eff4d..62ad689 100644
--- a/src/layoutparser/ocr/gcv_agent.py
+++ b/src/layoutparser/ocr/gcv_agent.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import io
 import os
 import json
diff --git a/src/layoutparser/ocr/tesseract_agent.py b/src/layoutparser/ocr/tesseract_agent.py
index 666cf9a..b7886b0 100644
--- a/src/layoutparser/ocr/tesseract_agent.py
+++ b/src/layoutparser/ocr/tesseract_agent.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import io
 import csv
 import pickle
diff --git a/src/layoutparser/visualization.py b/src/layoutparser/visualization.py
index c458778..afac401 100644
--- a/src/layoutparser/visualization.py
+++ b/src/layoutparser/visualization.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from typing import List, Union, Dict, Any, Tuple
 import functools
 import os
diff --git a/tests/fixtures/io/generate_test_jsons.py b/tests/fixtures/io/generate_test_jsons.py
index e0c5183..5d16c00 100644
--- a/tests/fixtures/io/generate_test_jsons.py
+++ b/tests/fixtures/io/generate_test_jsons.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import json
 import numpy as np
 from layoutparser.elements import Interval, Rectangle, Quadrilateral, TextBlock, Layout
diff --git a/tests/test_elements.py b/tests/test_elements.py
index a13b23a..e504f91 100644
--- a/tests/test_elements.py
+++ b/tests/test_elements.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import pytest
 import numpy as np
 import pandas as pd
diff --git a/tests/test_io.py b/tests/test_io.py
index 305094e..330294a 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import numpy as np
 from layoutparser.elements import Interval, Rectangle, Quadrilateral, TextBlock, Layout
 from layoutparser.io import load_json, load_dict, load_csv
diff --git a/tests/test_model.py b/tests/test_model.py
index 0096d19..42ace8b 100644
--- a/tests/test_model.py
+++ b/tests/test_model.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import pytest
 import cv2
 
diff --git a/tests/test_ocr.py b/tests/test_ocr.py
index a05450d..0c42cfc 100644
--- a/tests/test_ocr.py
+++ b/tests/test_ocr.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from layoutparser import (
     GCVAgent,
     GCVFeatureType,
diff --git a/tests/test_visualization.py b/tests/test_visualization.py
index 3e6a242..eb357a3 100644
--- a/tests/test_visualization.py
+++ b/tests/test_visualization.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from layoutparser.elements import *
 from layoutparser.ocr import *
 from layoutparser.visualization import *
diff --git a/tests_deps/test_file_utils.py b/tests_deps/test_file_utils.py
index 9652e16..1e43d1b 100644
--- a/tests_deps/test_file_utils.py
+++ b/tests_deps/test_file_utils.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Layout Parser team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import pytest
 
 from layoutparser import requires_backends