It could only be described as "mathematically perfect" in the sense that without the decryption key, the encrypted data is no more useful than random bytes. Bu

It could only be described as "mathematically perfect" in the sense that without the decryption key, the encrypted data is no more useful than random bytes. But DRM fundamentally needs to have the decryption key available at the end user's device - which at least in my opinion, makes it better described as "provably mathematically impossible".