Can’t be opened because the identity of the developer cannot be confirmed Fix

Can't be opened because the identity of the developer cannot be confirmed

I have seen this Mac problem quite long time ago, and I keep forgetting how I fix it whenever I have it again and again.

At this time, with Yosemite OS X, I downloaded an update .dmg file from LibreOffice, and when I wanted to open the application, it did say, can’t be opened because the identity of the developer cannot be confirmed.

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