Repository: sympy/sympy
Pull request: Added LICENSE for PyDy
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#### Brief description of what is fixed or changed
#15372 
Fixes #15214

#### Other comments
ping @certik @moorepants 

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Problem statement:
PyDy examples need to include the PyDy license
There is a new directory in `sympy/parsing/autolev/tests`:

```
│   ├── pydy-example-repo
│   │   ├── chaos_pendulum.al
│   │   ├── chaos_pendulum.py
│   │   ├── double_pendulum.al
│   │   ├── double_pendulum.py
│   │   ├── __init__.py
│   │   ├── mass_spring_damper.al
│   │   ├── mass_spring_damper.py
│   │   ├── non_min_pendulum.al
│   │   └── non_min_pendulum.py
```

These examples are copied from PyDy, but the PyDy license isn't included. I don't care personally, but we should probably follow protocol and include the PyDy license.

Hints from issue discussion:
@NikhilPappu fyi
@moorepants Sure, I shall include it.
i am not able to find PyDy license ? do you mean including this [citation](http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1830918) ? 
https://github.com/pydy/pydy/blob/master/LICENSE.txt
I am interested in working on this issue. is it still open?

Commit message: shifted py-dy license

Patch to review:
diff --git a/LICENSE b/LICENSE
index 697f50363ff3..e7ef8be66055 100644
--- a/LICENSE
+++ b/LICENSE
@@ -95,3 +95,34 @@ 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.
+
+--------------------------------------------------------------------------------
+
+The files under the directory sympy/parsing/autolev/tests/pydy-example-repo
+are directly copied from PyDy project and are licensed as:
+
+Copyright (c) 2009-2017, PyDy Authors
+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 this project 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 PYDY AUTHORS 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.


Code review comments:
diff_hunk: @@ -95,3 +95,34 @@ 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.
+
+--------------------------------------------------------------------------------
+
+The files under the directory sympy/parsing/autolev/tests/pydy-example-repo
+are directly copied from PyDy project and are licensed as:
+
+Copyright (c) 2009-2017, PyDy Authors
path: LICENSE
text: @user1:
```suggestion
Copyright (c) 2009-2019, PyDy Authors
```