title: How to encrypt and decrypt a video file in android
body: <p>I have a question that I want to encrypt the video file when finished playing and after that when user again want to play the same I have to decrypt that. Means I have to encrypt the file at onCompletion of the video and decrypt the video file when want to be playing. </p>
  
  <p>This is for only security reasons that user can not transmit it to another place.</p>
  
  <p>Thanks in advance.</p>