Password protected video

I want to protect my instructional video with a password. There is a use case. When a user wants to play an encrypted file (*update: file located on user's android device*), the encrypted file will pop up a dialog box to request the user to enter a Playback Password. This dialog box will display the machine ID of the user's android device. The user can send his/her own machine ID to you, and you can create a Playback Password based on the user's machine ID. After that the user can use this Playback Password to play your file on his/her device. Since the Playback Password is created based on the user's machine ID, the user will not be able to share the Playback Password with other users. Since the Playback Password is bond to the user's device, the user will not be able to re-distribute your files. Is there some software that helps me to obtain this purpose? --- I seem to have secured the streaming video from the web site well enough, but a lot of the members want video files on their devices because they don't want to have to deal with wi-fi to play the video while they conduct the class. (*update: I'm not good in English. I meant file need to be located on user's android device. No streaming*) --- There is no doubt someone can just shoot the video from the screen, but I want to slow down the proliferation of my video.