This is a demonstration of secure HLS end to end encryption. These videos were encrypted by Amazon AWS. FV Player is able to decrypt them and only play them to Your users. These videos can't be hotlinked, or downloaded and played offline. This adds another layer of security to Your videos.
You can learn how to create and encrypted HLS with Amazon Elastic Transcoder in this guide - How to setup encrypted HLS stream with Amazon Elastic Transcoder
