"In theory" is a bit of a slippery term, since all encryption can be cracked in theory.

This is what we call The Fallacy of Gray. There is a rather clear difference between the possibility of brute forcing 1024 bit encryption and the utter absurdity of considering a DRMed multimedia file 'secure' when I could violate it using a smartphone with a video camera (and lossless proof-of-concept violations are as simple as realising that vmware exists.)