move notice info to NOTICE file and add LICENSE docs for docs dir

LICENSE

@@ -1,20 +1,3 @@
-CrateDB Guide
-Copyright 2017 Crate.IO GmbH ("Crate")
-
-
-Licensed to CRATE Technology GmbH (referred to in this notice as "Crate")
-under one or more contributor license agreements.  See the NOTICE file
-distributed with this work for additional information regarding copyright
-ownership.
-
-Crate licenses this software to you under the Apache License, Version 2.0.
-However, if you have executed another commercial license agreement with
-Crate these terms will supersede the license and you may use the software
-solely pursuant to the terms of the relevant commercial agreement.
-
-
-=========================================================================
-
 
                                  Apache License
                            Version 2.0, January 2004
@@ -217,3 +200,48 @@ solely pursuant to the terms of the relevant commercial agreement.
    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.
+
+
+===============================================================================
+
+For the `docs` directory:
+
+The source files for the documentation are licensed under the Apache License
+Version 2.0. These source files are used by the project maintainers to build
+online documentation for end-users:
+
+  <https://crate.io/docs/crate/guide/en/latest/>
+
+If you want to make contributions to the documentation, it may be necessary for
+you to build the documentation yourself by following the instructions in the
+`DEVELOP.rst` file. If you do this, a number of third-party software components
+are necessary.
+
+We do not ship the source code for these optional third-party software
+components or their dependencies, so we cannot make any guarantees about the
+licensing status of these components.
+
+However, for convenience, the documentation build system explicitly references
+the following software components (grouped by license):
+
+PSF License:
+
+ - Python 3 <https://docs.python.org/3/license.html>
+
+MIT License:
+
+ - pip <https://pypi.org/project/pip/>
+ - setuptools <https://pypi.org/project/setuptools/>
+ - sphinx-autobuild <https://pypi.org/project/sphinx-autobuild/>
+
+BSD License:
+
+ - alabaster <https://pypi.org/project/alabaster/>
+ - sphinx <https://pypi.org/project/Sphinx/>
+
+Apache License 2.0:
+
+ - crate-docs-theme <https://pypi.org/project/crate-docs-theme/>
+
+Please note that each of these components may specify its own dependencies and
+those dependencies may be licensed differently.

NOTICE

@@ -0,0 +1,12 @@
+CrateDB Guide
+Copyright 2017 Crate.IO GmbH ("Crate")
+
+Licensed to Crate.IO GmbH (referred to in this notice as "Crate") under one or
+more contributor license agreements.
+
+Unless otherwise stated, every component of the CrateDB Guide is licensed under
+the Apache License, Version 2.0.
+
+Third-party components bundled with the CrateDB Guide are listed in the LICENSE
+file along with their respective licenses. Any additional mandatory notices
+pertaining to those dependencies will be reproduced in this file.