High Quality Content by WIKIPEDIA articles! A digital DJ license is required in some countries, including the United Kingdom, Finland and Canada, to publicly play digital copies of copyrighted music. The license allows a DJ to copy music from original cds, vinyl or other media, to a computer`s hard drive, an mp3 player or other digital audio players, for example to be used with a vinyl emulation software program, or in some cases to other digital media, such as cd-r or MiniDisc. In the countries where digital DJ licensing is used, the license is also required for playing music originally bought and downloaded directly on to a computer, usually in mp3 or similar format, unless the license of the online music store explicitly allows the public performance of the downloaded tracks.