The DMCA says it needs to be "effective," but then defines it as >technological measure "effectively controls access to a work" if the measure, in the ordinary

The DMCA says it needs to be "effective," but then defines it as >technological measure "effectively controls access to a work" if the measure, in the ordinary course of its operation, requires the application of information, or a process or a treatment, with the authority of the copyright owner, to gain access to the work. Which sounds like basically anything they call DRM is DRM.