The following portions of the YDLIDAR’s YDlidar SDK (“Software” referred to in the terms below) are made available to you under the terms of the MIT License provided below.  

YDLidar-SDK
├── cmake
│   ├── cmake_uninstall.cmake.in
│   ├── common
│   │   ├── ydlidar_base.cmake
│   │   └── ydlidar_parse.cmake
│   ├── FindPackage.cmake.in
│   ├── install_package.cmake
│   ├── PackageConfig.cmake.in
│   ├── PackageConfigVersion.cmake.in
│   └── PkgConfig.pc.in
├── CMakeLists.txt
├── core
│   ├── base
│   │   ├── CMakeLists.txt
│   │   ├── datatype.h
│   │   ├── locker.h
│   │   ├── thread.h
│   │   ├── timer.cpp
│   │   ├── timer.h
│   │   ├── typedef.h
│   │   ├── utils.h
│   │   ├── v8stdint.h
│   │   └── ydlidar.h
│   ├── CMakeLists.txt
│   ├── common
│   │   ├── ChannelDevice.h
│   │   ├── CMakeLists.txt
│   │   ├── DriverInterface.h
│   │   ├── ydlidar_datatype.h
│   │   ├── ydlidar_def.cpp
│   │   ├── ydlidar_def.h
│   │   ├── ydlidar_help.h
│   │   └── ydlidar_protocol.h
│   ├── math
│   │   ├── angles.h
│   │   └── CMakeLists.txt
│   ├── network
│   │   ├── ActiveSocket.cpp
│   │   ├── ActiveSocket.h
│   │   ├── CMakeLists.txt
│   │   ├── PassiveSocket.cpp
│   │   ├── PassiveSocket.h
│   │   ├── SimpleSocket.cpp
│   │   ├── SimpleSocket.h
│   │   └── StatTimer.h
│   └── serial
│       ├── CMakeLists.txt
│       ├── common.h
│       ├── impl
│       │   ├── CMakeLists.txt
│       │   ├── unix
│       │   │   ├── CMakeLists.txt
│       │   │   ├── list_ports_linux.cpp
│       │   │   ├── lock.c
│       │   │   ├── lock.h
│       │   │   ├── unix.h
│       │   │   ├── unix_serial.cpp
│       │   │   └── unix_serial.h
│       │   └── windows
│       │       ├── CMakeLists.txt
│       │       ├── list_ports_win.cpp
│       │       ├── win.h
│       │       ├── win_serial.cpp
│       │       └── win_serial.h
│       ├── serial.cpp
│       └── serial.h
├── csharp
│   ├── CMakeLists.txt
│   ├── examples
│   │   └── CMakeLists.txt
│   └── ydlidar_sdk.i
├── LICENSE.txt
├── python
│   ├── CMakeLists.txt
│   ├── examples
│   │   ├── CMakeLists.txt
│   │   ├── etlidar_test.py
│   │   ├── plot_tof_test.py
│   │   ├── plot_ydlidar_test.py
│   │   ├── test.py
│   │   ├── tof_test.py
│   │   └── ydlidar_test.py
│   ├── numpy.i
│   ├── test
│   │   └── pytest.py
│   ├── ydlidar_numpy.i
│   └── ydlidar_sdk.i
├── README.md
├── samples
│   ├── CMakeLists.txt
│   ├── etlidar_test.cpp
│   ├── lidar_c_api_test.c
│   ├── tof_test.cpp
│   └── ydlidar_test.cpp
├── setup.py
├── src
│   ├── CMakeLists.txt
│   ├── CYdLidar.cpp
│   ├── CYdLidar.h
│   ├── ETLidarDriver.cpp
│   ├── ETLidarDriver.h
│   ├── ydlidar_driver.cpp
│   ├── ydlidar_driver.h
│   ├── ydlidar_sdk.cpp
│   └── ydlidar_sdk.h
├── startup
│   └── initenv.sh
└── ydlidar_config.h.in




-------------------------------------------------------------
The MIT License (MIT)

Copyright (c) 2019-2020 EAIBOT. All rights reserved.

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.
===============================================================

serial
├── CMakeLists.txt
├── common.h
├── impl
│   ├── CMakeLists.txt
│   ├── unix
│   │   ├── CMakeLists.txt
│   │   ├── list_ports_linux.cpp
│   │   ├── lock.c
│   │   ├── lock.h
│   │   ├── unix.h
│   │   ├── unix_serial.cpp
│   │   └── unix_serial.h
│   └── windows
│       ├── CMakeLists.txt
│       ├── list_ports_win.cpp
│       ├── win.h
│       ├── win_serial.cpp
│       └── win_serial.h
├── serial.cpp
└── serial.h

YDLIDAR’s YDLidar-SDK uses modified libraries of serial (https://github.com/wjwwood/serial), which is licensed under MIT license. A copy of the MIT license is provided below and is also available at https://raw.githubusercontent.com/wjwwood/serial/master/README.md.

The MIT License

Copyright (c) 2012 William Woodall, John Harrison

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.
===============================================================

For the math\angles.h component:

/*********************************************************************
* Software License Agreement (BSD License)
*
*  Copyright (c) 2008, Willow Garage, Inc.
*  All rights reserved.
*
*  Redistribution and use in source and binary forms, with or without
*  modification, are permitted provided that the following conditions
*  are met:
*
*   * Redistributions of source code must retain the above copyright
*     notice, this list of conditions and the following disclaimer.
*   * Redistributions in binary form must reproduce the above
*     copyright notice, this list of conditions and the following
*     disclaimer in the documentation and/or other materials provided
*     with the distribution.
*   * Neither the name of the Willow Garage nor the names of its
*     contributors may be used to endorse or promote products derived
*     from this software without specific prior written permission.
*
*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
*  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
*  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
*  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
*  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
*  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
*  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
*  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
*  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
*  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
*  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
*  POSSIBILITY OF SUCH DAMAGE.
*********************************************************************/

===============================================================
For the network library:

/* Copyright (c) 2006 CarrierLabs, LLC.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * 4. The name "CarrierLabs" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    mark@carrierlabs.com.
 *
 * THIS SOFTWARE IS PROVIDED BY MARK CARRIER ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL MARK CARRIER OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *----------------------------------------------------------------------------*/


