Audacity's purpose is not to produce software. Audacity uses a GNU General Public License to distribute the application. This type of license is used a lot in free software licensing and is the most popular and well known for strong copyright theft protection. This license was written by Richard Stallman for the GNU Project.
Links
[1] http://theingots.org/community/node/2477
[2] http://theingots.org/community/node/2478
[3] http://theingots.org/community/node/2568
[4] http://theingots.org/community/node/2569
[5] http://theingots.org/community/node/2570
[6] http://theingots.org/community/node/2571
[7] http://theingots.org/community/node/2572
[8] http://theingots.org/community/node/2573
[9] http://theingots.org/community/node/2574
[10] http://theingots.org/community/node/2575
[11] http://theingots.org/community/node/2576
[12] http://theingots.org/community/node/2577
[13] http://theingots.org/community/node/2578
[14] http://theingots.org/community/node/2579
[15] http://theingots.org/community/node/2580
[16] http://theingots.org/community/node/2581