diff --git a/lite/arm/math/interpolate.cc b/lite/arm/math/interpolate.cc
index 8a4a07d60083b1143de19266d97878eb153854f5..0e4dbdca694cfe1bfb6176b9aaa9b29a1719e311 100644
--- a/lite/arm/math/interpolate.cc
+++ b/lite/arm/math/interpolate.cc
@@ -22,6 +22,24 @@ namespace lite {
 namespace arm {
 namespace math {
 
+// The following function bilinear_interp is partially base on
+// https://github.com/Tencent/ncnn/blob/master/src/layer/arm/interp_arm.cpp
+// Tencent is pleased to support the open source community by making ncnn
+// available.
+//
+// Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+//
+// Licensed under the BSD 3-Clause License (the "License"); you may not use this
+// file except
+// in compliance with the License. You may obtain a copy of the License at
+//
+// https://opensource.org/licenses/BSD-3-Clause
+//
+// 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.
 void bilinear_interp(const float* src,
                      int w_in,
                      int h_in,
diff --git a/lite/arm/math/packed_sgemm.cc b/lite/arm/math/packed_sgemm.cc
index bcfb0e2a9f7b21e4c8eb312c7ea5e4dc6040559e..c0c5c76c0f28670acd9cea0dbbc85d0ff0f92487 100644
--- a/lite/arm/math/packed_sgemm.cc
+++ b/lite/arm/math/packed_sgemm.cc
@@ -262,6 +262,33 @@ void sgemm_prepack(bool is_transB,
 }
 
 #ifdef __aarch64__
+/*
+ * The following function prepackA_8x12 is base on
+ * https://github.com/ARM-software/ComputeLibrary/
+ *
+ * Copyright (c) 2017-2019 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
 void prepackA_8x12(float *dout,
                    const float *inptr,
                    float alpha,
diff --git a/lite/core/cpu_info.cc b/lite/core/cpu_info.cc
index e99adf8b2a06b92bc5a1109f24d9c9ef80e85484..4b352eee93289847bab42635b3731ab0db548021 100644
--- a/lite/core/cpu_info.cc
+++ b/lite/core/cpu_info.cc
@@ -12,6 +12,25 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Parts of the following code in this file refs to
+// https://github.com/Tencent/ncnn/blob/master/src/cpu.cpp
+// Tencent is pleased to support the open source community by making ncnn
+// available.
+//
+// Copyright (C) 2017 THL A29 Limited, a Tencent company. All rights reserved.
+//
+// Licensed under the BSD 3-Clause License (the "License"); you may not use this
+// file except in compliance with the License. You may obtain a copy of the
+// License at
+//
+// https://opensource.org/licenses/BSD-3-Clause
+//
+// 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.
+
 #ifdef LITE_WITH_LINUX
 #include <sys/syscall.h>
 #include <unistd.h>