1) The document proposes a novel method for reversible data hiding in encrypted videos using a traditional reversible data hiding (RDH) algorithm to make it easy for data hiders to embed data in encrypted videos.
2) It uses a least significant bit (LSB) replacement algorithm to find space in video pixels to hide data behind the video.
3) Experiments showed the method can embed over 10 times as much data as previous methods for the same video quality. The goal was to predictably hide data behind videos using an advanced video steganography technique with encryption and LSB replacement algorithm.