Cannot open LibreOffice because Mac OSX Maverick dialog box claims the "identity of the developer cannot be confirmed

How can I confirm the developer and use this software

Is it that you cannot “open” or you cannot “install”? Please provide more details; here is a reference: What information should I include in a question in addition to OS and LibreOffice version? - #4 by ROSt53

See http://support.apple.com/kb/PH14369