That ruling is common sense, but also exposes how unnecessary it is to prohibit breaking DRM separately from infringing copyright.
If you break DRM for a non-infringing use, so what? The creator isn't affected (beyond cases where they would like to sell multiple copies in different file formats) in that case. Where someone breaks DRM to infringe copyright, then they've infringed copyright, which already allows the affected copyrightholder legal remedies.
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