What license(s) are the Android support libraries released under? -

i've been reading through documentation android support library, while explicitly says should include in android project, doesn't mention license library under (the license notice present applies contents of documentation page, not code describes). copy spat out eclipse not include licensing information either, , queries google link same documentation pages.

this confuses me. should include notice code google? not put in license notice @ all? or not understanding how library meant used? admittedly, quite new android development.

each source file, (like this one) contains copyright header this:

/*  * copyright (c) 2011 android open source project  *  * licensed under apache license, version 2.0 (the "license");  * may not use file except in compliance license.  * may obtain copy of license @  *  *      http://www.apache.org/licenses/license-2.0  *  * unless required applicable law or agreed in writing, software  * distributed under license distributed on "as is" basis,  * without warranties or conditions of kind, either express or implied.  * see license specific language governing permissions ,  * limitations under license.  */ 

which states apache license:

http://www.apache.org/licenses/license-2.0

and, think apache license allows derivative works built , sold. still, should:

1. include same license in source of derived product well.
2. clearly state parts derived changes, built upon.

you can place in licence.txt or readme.txt @ root of project.