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+=== Asterisk Add-on Modules ===
+ This document pertains to the modules that reside in the addons/
+subdirectory of the source tree. By default, these modules are not compiled
+and installed. If you choose to enable them, you must be aware of what
+potential licensing and/or patent implications that has on your usage and
+distribution of Asterisk.
+ Even though Asterisk is released as open source under the terms of the
+GPLv2 (see LICENSE for details), no core functionality in Asterisk has any
+dependencies on libraries that are licensed under the GPL. One reason a module
+may be in the add-ons category is that it may have a GPL dependency. Since
+these dependencies are not compatible with dual licensing of Asterisk, the
+dependant modules are set aside to make it clear that they may not be used
+with commercial versions of Asterisk, unless other licensing arrangements are
+made with the copyright holders of those dependencies.
+ Another reason that modules may be set aside is that there may be
+additional restrictions on the usage of the code imposed by the license or
+related patents. The MySQL and MP3 modules are examples of this.
+ If you have any questions, contact your lawyer.