A system, method and various software tools enable a video hosting website to automatically identified unlicensed audio content in video files uploaded by users, and initiate a process by which the user can replace the unlicensed content with licensed audio content. An audio replacement tool is provided that enables the user to permanently mute the original, unlicensed audio content of a video file, or select a licensed audio file from a collection of licensed audio, and insert the selected in place of the original audio. Where a video file includes unlicensed audio, the video hosting website provides access to video files to a client device, along with an indication to the client device to mute the audio during playback of the video.