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Asterisk License Information
Asterisk is distributed under the GNU General Public License version 2 and is also available under alternative licenses negotiated directly with Digium, Inc. If you obtained Asterisk under the GPL, then the GPL applies to all loadable Asterisk modules used on your system as well, except as defined below. The GPL (version 2) is included in this source tree in the file COPYING.
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Frequently Asked Questions about Licensing
What is an open-source license?
How does Digium legally provide Asterisk under alternative licenses other than the GPL?
Is dual-licensing beneficial for the future of open-source?