I got some HD mp4 files from youtube HD, but they all have the same problem of this when I tried to add some watermark and save them as mov.
is there anyone know how to fix it?
It's a super secret copy protection that keeps people from stealing videos and editing them later. Similar to the DVD protection in this thread:
Does anyone know how to decrypt that?
I'm guessing you didn't actually read the post, did you ?
Read my blog here.