If the file is protected by DRM, Switch will not convert the file. As stated on the NCH website (http://www.nch.com.au/switch/kb/1449.html):
Digital Rights Management, or DRM, is a class of technologies that allow rights owners to set and enforce terms by which people use their intellectual property.
Rights owners are typically copyright-holding companies like music, film, book or software publishers. They use DRM to control how documents, entire software programs, or even e-mails are used.
NCH Software does not support tampering with DRM Protected Files.
Tampering with such files is illegal.