Does Dropbox scan all user content for copyrighted content being shared, or does Dropbox only act if it receives a DMCA takedown notice? I am asking because my YouTube channel has received several fraudulent (and subsequently quashed in court) takedown notices due to content being submitted to their "Content ID" database by parties who lack legitimate ownership.
If I only have to be concerned about action by Dropbox in response to complaints then this is a non-issue, as legitimate ones will never be submitted and false ones are easily quashed when they do infrequently occur. However, if I have to be concerned about my content being scanned by Dropbox, then the soundness and integrity of the database being used by Dropbox becomes a consideration.