The basic MP3 decoding and encoding technology is patent-free in the European Union, all patents having expired there. In the United States, the technology will be substantially patent-free on 31 December 2017 (see below). The majority of MP3 patents expired in the US between 2007 and 2015.
వారు పేటెంట్ రహితంగా ఉండటానికి కారణమైన పేటెంట్లకు ఏమి జరిగింది?
expired