TorrentFreak reports that Google is threatening action against one of the web’s largest YouTube conversion sites. The site, YouTube-MP3.org, extracts MP3 audio from YouTube videos and makes it available for users to download.

According to Google’s own statistics, the site attracts 1.3 million visits per day. Google is demanding that the website cease using the YouTube API to allow users to “separate, isolate, or modify the audio or video components of any YouTube audiovisual content.”