For example, programs such as BitTorrent have been declared by courts to be legal, but the software itself does not give you legal rights to content (the music or movie files you play using the software). Currently, most software that plays digital files is legal, even if it allows you to play or share illegal files. The software used to play the file: Often, the software owner provides this for free, or requires a service fee that makes downloading and using the media files easy.To use online media files legally, you must ensure you are obtaining two things legally: