In September 1998, the Fraunhofer Institute sent a letter to several developers of MP3 software stating that a license was required to "distribute and/or sell decoders and/or encoders".
在1998年9月，Fraunhofer Institute向幾個MP3軟件開發者發去了一封信聲明「發布或者銷售編碼器或者解碼器」需要授權。