@carlwgeorge Yes, it is. This is a media-processing library. It handles user-supplied data, potentially over the network. Therefore, it's security sensitive. If I didn't update libebml and libmatroska, I wouldn't be able to update mkvtoolnix past version 47. With mkvtoolnix's monthly release schedule, Fedora 32 would be around 10 releases behind upstream by the time it goes EOL. In my opinion, this was unacceptable, hence the update.