Stream-ripping is now the fastest-growing form of music piracy in the UK, new research has suggested. From a report: Several sites and apps allow users to turn Spotify songs, YouTube videos and other streaming content into permanent files to store on phones and computers. Record labels claim that "tens, or even hundreds of millions of tracks are illegally copied and distributed by stream-ripping services each month." One service alone is thought to have more than 60 million monthly users. According to research by the Intellectual Property Office and PRS For Music, 15 percent of adults in the UK regularly use these services, with 33 percent of them coming from the 16-24 age bracket. Overall usage of stream-ripping sites increased by 141.3 percent between 2014 and 2016, overshadowing all other illegal music services.