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Copyright(c) 2014 Bernard Yue

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

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

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
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.

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Here's what the Apache license says in layman's terms:

It allows you to:

  - freely download and use Apache licensed software, in whole or in part, 
    for personal, company internal, or commercial purposes;
  - use Apache licensed software in packages or distributions that you create.

It forbids you to:

  - redistribute any piece of Apache licensed software without proper
    attribution;
  - use any marks owned by The Apache Software Foundation in any way that 
    might state or imply that the Foundation endorses your distribution;
  - use any marks owned by The Apache Software Foundation in any way that
    might state or imply that you created the Apache licensed software in 
    question.

It requires you to:

  - include a copy of the license in any redistribution you may make that
    includes Apache licensed software;
  - provide clear attribution to The Apache licensed Software licensor for any 
    distributions that include the Apache licensed software.

It does not require you to:

  - include the source of the Apache licensed software itself, or of any 
    modifications you may have made to it, in any redistribution you may 
    assemble that includes it;
  - submit changes that you make to the software back to the the Apache licensed
    Software licensor (though such feedback is encouraged).


You can refer http://www.apache.org/foundation/license-faq.html for more on
Apache 2.0 license particulars