"bypassing DRM" is explicitly illegal according to DMCA. Don't conflate "unenforce{d,able}" and "legal".

Gosh, I didn't know the DMCA went that far. I had assumed it was in line with Canada's TPM related laws which do disallow direct circumvention of DRM but do specifically except format shifting if the copy will be used for a legal purpose. I guess be careful and check your local jurisdiction.