When a song is DRM protected, it means that the content is encrypted with digital rights management technology that restricts access, copying, and distribution of the song. This restriction may include limitations on the number of devices the song can be played on, the number of times it can be copied, or the length of time the song can be accessed. DRM protected songs require authorized access to be played, typically through a specific digital media player or app. This technology is often used by music and media companies to protect their copyrighted works from piracy and unauthorized use.