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=== Asterisk Add-on Modules ===

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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.

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