Every minute, people upload more than 500 hours of video to YouTube — cat videos, music videos, even videos of people recording their audio podcasts. And some of those clips include content the people uploading them don’t own, like clips of music from popular songs. YouTube, and its owner, Google, have an automated technology called Content ID that regularly scans for copyrighted material — including music — and flags it for copyright holders. Marketplace’s Kimberly Adams spoke about this with Marketplace’s Peter Balonon-Rosen, who explained why the system has some musicians frustrated.