(When you get there, scroll down the page you land on to get to the operating-specific downloads of LAME – lots of ads on that page!) Reverse engineering of a technical process is recognized around the world as not being a violation of patents or copyrights. A group of software geeks got together, and working backwards from a finished MP3, figured out the process (or their version of the process) that T-F created to encode MP3s. LAME is an open source, reverse engineered version of the actual, official Fraunhofer-Thomson MP3 encoder that the company licenses for money. That collides with the concepts and requirements of open source software. The company that created the MP3 format charges money for each of their MP3 encoders that get distributed. You need to make MP3s, and Audacity (and LAME) are free and open source. It actually stands for LAME Ain’t an MP3 Encoder – and for good reason. LAME, the MP3-exporting plugin for Audacity, enables software that doesn’t have built-in MP3 export capability (like Audacity) to spit out MP3 files.

Audacity mp3 plugin