The Apache License is a free software license authored by the Apache Software Foundation (ASF). The Apache License requires preservation of the copyright notice and disclaimer, but it is not a copyleft license — it allows use of the source code for the development of proprietary software as well as free and open source software.
All software produced by the ASF or any of its projects or subjects is licensed according to the terms of the Apache License. Some non-ASF software is licensed using the Apache License as well. As of July 2009, over 5000 non-ASF projects located at SourceForge.net were available under the terms of the Apache License. In a blog post from May 2008 Google mentioned that 25% of the 100,000 projects then hosted on Google Code were using the Apache License.
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