I started programming DVDs back in the mid-to-late 90s. I got out of shiny round discs right about the time the HD-DVD/Blu-ray war was still raging recognizing that streaming was the future. I wasn't that entrenched into the HD disc formats, but I remember reading the master key for AACS was leaked making it easy to circumvent. It wasn't as easy as DVD's CSS to crack, but once the master key was in the wild it was game over. Just another example in the wild of why backdoors/master-key encryption concepts are bad.