Is FDK nonfree   The article says The fifth is the nonfree libfdkaachttpsgithubcomFFmpegFFmpegblobmasterlibavcodeclibfdkaacencc the Fraunhofer FDK AAC library which is purported to be a high quality aac implementationhttpffmpegzeranoecomforumviewtopicphpftphilitaacp  Is this accurate  Unless Im misinterpreting something this is the license for the linked codec and it appears to be reasonably free  open