B757-200 IS DISPATCHED WITH DATABASE OUT OF DATE. FLT CREW REALIZED ENROUTE THAT A DEFERRAL WAS NECESSARY FOR THIS ANOMALY.

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ARRIVED AT THE ACFT FOR DEP TO FIND UNKNOWN WRITE-UP MEL ON SPOILERS. LOOKED UP TKOF AND LNDG RESTRS; SPD RESTRS AND ALT RESTR. CALLED DISPATCH TO RPT DISCREPANCY AND ASKED FOR RELEASE TO CONTINUE. RECEIVED RELEASE OVER RADIO VERBALLY. WHEN ENTERING DATA FOUND NAV DATABASE OUT OF DATE. CALLED AND REQUESTED MAINT TO THE ACFT. MAINT ASKED WHAT IT WAS REGARDING; TOLD THEM DATABASE. MECH CAME ABOARD AND WE SHOWED HIM THE DATABASE WAS OUT OF DATE. HE SAID 'I DON'T KNOW WHY THEY DIDN'T FIX THAT.' THE MECH THEN CALLED MAINT FROM THE COCKPIT AND RPTED TO THEM. MAINT TOLD HIM THAT THE PLANE WAS SCHEDULED TO BE UPDATED IN ZZZ1. THE MECH TOLD US THAT WE WERE GOOD TO GO. IT WAS NOW DEP TIME AND THE LOADER WAS STANDING IN THE PLANE WITH THE MANIFEST. WE THANKED THE MECH AND PROCEEDED TO BLOCK 4 MINS LATE. WHILE ENRTE I DECIDED TO LOOK UP IN THE AOM TO CONFIRM WHAT WE WERE TOLD BY MAINT. I FOUND THAT A DEFERRAL WAS REQUIRED. I SENT AN ACARS TO DISPATCH AND INFORMED THEM. IN ZZZ2 I CALLED DISPATCH AND HE XFERRED ME TO MAINT WHO GAVE ME A CREW DEFERRAL OVER THE PHONE AS THERE WAS NO MAINT IN ZZZ2. WE FLEW THE ACFT ON TO ZZZ1 FROM ZZZ2 WITH THE DEFERRAL.