Some patents expired and no longer require license: https://en.wikipedia.org/wiki/MP3#Licensing.2C_ownership_and_legislation https://en.wikipedia.org/wiki/MP3#

Some patents expired and no longer require license: https://en.wikipedia.org/wiki/MP3#Licensing.2C_ownership_and_legislation https://en.wikipedia.org/wiki/MP3#Licensing.2C_ownership_and...