Office 365 content searches can find all sorts of information, but they cannot decrypt protected files in SharePoint and OneDrive for Business sites. This prompts the question of how to deal with protected files exported by a search. As it turns out, the combination of a rights management superuser and some PowerShell makes short work of unprotecting files so that they can be read by all.
https://www.petri.com/protected-documents-office-365-content-searches
