The MP3 codec is patented in the US, due to expire at the end of next year: https://en.wikipedia.org/wiki/MP3#Licensing.2C_ownership_and_legislation https://en.

The MP3 codec is patented in the US, due to expire at the end of next year: https://en.wikipedia.org/wiki/MP3#Licensing.2C_ownership_and_legislation https://en.wikipedia.org/wiki/MP3#Licensing.2C_ownership_and...