1 Asterisk is distributed under the GNU General Public License version 2
2 and is also available under alternative licenses negotiated directly
3 with Digium, Inc. If you obtained Asterisk under the GPL, then the GPL
4 applies to all loadable Asterisk modules used on your system as well,
5 except as defined below. The GPL (version 2) is included in this
6 source tree in the file COPYING.
8 This package also includes various components that are not part of
9 Asterisk itself; these components are in the 'contrib' directory
10 and its subdirectories. These components are also distributed under the
11 GPL version 2 as well.
13 Digium, Inc. (formerly Linux Support Services) holds copyright
14 and/or sufficient licenses to all components of the Asterisk
15 package, and therefore can grant, at its sole discretion, the ability
16 for companies, individuals, or organizations to create proprietary or
17 Open Source (even if not GPL) modules which may be dynamically linked at
18 runtime with the portions of Asterisk which fall under our
19 copyright/license umbrella, or are distributed under more flexible
22 If you wish to use our code in other GPL programs, don't worry --
23 there is no requirement that you provide the same exception in your
24 GPL'd products (although if you've written a module for Asterisk we
25 would strongly encourage you to make the same exception that we do).
27 Specific permission is also granted to link Asterisk with OpenSSL, OpenH323
28 and/or the UW IMAP Toolkit and distribute the resulting binary files.
30 In addition, Asterisk implements two management/control protocols: the
31 Asterisk Manager Interface (AMI) and the Asterisk Gateway Interface
32 (AGI). It is our belief that applications using these protocols to
33 manage or control an Asterisk instance do not have to be licensed
34 under the GPL or a compatible license, as we believe these protocols
35 do not create a 'derivative work' as referred to in the GPL. However,
36 should any court or other judiciary body find that these protocols do
37 fall under the terms of the GPL, then we hereby grant you a license to
38 use these protocols in combination with Asterisk in external
39 applications licensed under any license you wish.
41 The 'Asterisk' name and logos are trademarks owned by Digium, Inc.,
42 and use of them is subject to our trademark licensing policies. If you
43 wish to use these trademarks for purposes other than simple
44 redistribution of Asterisk source code obtained from Digium, you
45 should contact our licensing department to determine the necessary
46 steps you must take. For more information on this policy, please read:
48 http://www.digium.com/en/company/profile/trademarkpolicy.php
50 If you have any questions regarding our licensing policy, please
53 +1.877.344.4861 (via telephone in the USA)
54 +1.256.428.6000 (via telephone outside the USA)
55 +1.256.864.0464 (via FAX inside or outside the USA)
56 IAX2/pbx.digium.com (via IAX2)
57 licensing@digium.com (via email)