Enable Desktop Search Support for Protected Documents
Enable the Windows search indexer to read and index protected documents
we’ll look into it
Bill Hughes commented
Windows search indexer support would be nice however I believe it should be restricted to only "managed" devices either through domain joined/SCCM, or MDM management of the OS and not just made available to any OSE.
Max Visser commented
I would like to add the Sharepoint search indexer, eDiscovery Indexer and Delve to this suggestion. The reason that search doesn't index protected documents is because the documents are encrypted. I am not in a support to let search engines cache the content of protected documents for a long period of time.
If this is not possible, I see an easy workaround: there should be an alert after search: 'We found 21 protected documents, that are not indexed by Windows Search.'. (Instead of not showing them in the search results at all.)