The API documentation is provided under the following copyright and the BSD-3-Clause license:

    Copyright Raritan Inc. All rights reserved.

The license text can be found in the file LICENSES/BSD-3-Clause.

NOTE: The following files have a different copyright and license as declared in the file itself:

    html/dynsections.js
    html/menudata.js
    html/menu.js
    html/search/search.js
    html/jquery.js

Other Javascript files are generated code and have no specific copyright.
