> Under United States federal law, making a backup copy of a DVD-Video or an audio CD by a consumer is legal under fair use protection. However, this provision of United States law conflicts with the Digital Millennium Copyright Act prohibition of so-called "circumvention measures" of copy protections.
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> In the 2004 "321" case, Federal District Judge Susan Illston of the Northern District of California, ruled that the backup copies made with software such as DVD Decrypter are legal but that distribution of the software used to make them is illegal.
Further problem though:
> In 2010, the Librarian of Congress instituted a DMCA exemption which protects circumvention of CSS protection under certain circumstances. This exemption expired in 2013.
Therefore, it seems to be a "case by case" basis type situation currently.