Download Video Padlock
If you are searching for a utility which will let you lock and hide all your downloaded video files irrespective of type of content, then you can go for Video Padlock. This is a encryption software that uses strong ARC4 encryption for locking videos as well as audios in the program itself with strong password encryption. This tool is able to lock FLV, MPEG, MOV, WMV and QuickTime videos.
To encrypt and lock video files with Video Padlock, you need to browse to the file from the interface, select it and hide. The files will get hidden instantly. You can play the videos inside after entering with master password. It can encrypt just the first 50 kb of large files which lets the user play such files instantly, but does not let others access it.