[fjtorres]

The goal of "hardened" DRM is to minimize illegal sharing, not stop professional pirates.
That goal is readily achievable with app-locked content that does not expose discrete files in the file system and uses per-file keys or always-on authentication. It also unduly restricts fair use for my taste but there's plenty of folks out there who wouldn't mind.

Just because an experienced cryptologist can break the encryption doesn't mean the DRM system has failed in its mission. The actual metric they care about is how much "leakage" filters out past that specific DRM.