merge branch 'pr-1903'

  clarify license information

LGTMs: @hqhq @cyphar
Closes #1903

Author: cyphar

README.md

@@ -263,3 +263,7 @@ PIDFile=/run/mycontainerid.pid
 [Install]
 WantedBy=multi-user.target
 ```
+
+## License
+
+The code and docs are released under the [Apache 2.0 license](LICENSE).

libcontainer/README.md

@@ -323,6 +323,7 @@ generated when building libcontainer with docker.
 
 ## Copyright and license
 
-Code and documentation copyright 2014 Docker, inc. Code released under the Apache 2.0 license.
-Docs released under Creative commons.
-
+Code and documentation copyright 2014 Docker, inc.
+The code and documentation are released under the [Apache 2.0 license](../LICENSE).
+The documentation is also released under Creative Commons Attribution 4.0 International License.
+You may obtain a copy of the license, titled CC-BY-4.0, at http://creativecommons.org/licenses/by/4.0/.