PrivatePlayer helps you to send private or otherwise sensitive and confidential video to your friends. You can be sure that only the person you trust can play the encrypted video on his device.
No part of the video is present inside the friends device unencrypted even temporarily, and PrivatePlayer decrypts it in real-time during playback. Yes, PrivatePlayer is fast enough to do its job and to play 4K video simultaneously.
So, why do you need to trust your friend not to abuse your sensitive information? It is technically impossible to prevent somebody capturing a video directly from his screen. If content from your video leaks, it means that you have probably trusted the wrong person.
Both parties involved in encryption have to install PrivatePlayer application.