I am new to Mac ecosystem. I am not able to play a video in VLC which is locked. Thanks!
What do you mean by "locked"? If it's a file with DRM, you will need to get a license for the video.
if it is password protected then you need the password. if it is corrupted perhaps you can convert it to another format
Conversion of a corrupted file will, at best, result in an incomplete file.
What do you mean by "locked"? I've never seen that with regard to videos.