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Digium distributes Asterisk under a multi-licensing model often referred to as Dual-licensing and is additionally made possible by a Contributors License Agreement. This allows Digium to provide Asterisk under licenses other than the GPL. Digium provides information on their alternative commercial licensing at their website.

Some say Dual-licensing is the future of commercial open-source! here is a blog post by Tristan Rhodes and a blog post by Mark Spencer both discussing how dual-licensing is beneficial for open-source projects.

How can I contribute to Asterisk?