B767-300ER CAPTAIN IS CONCERNED THAT THE ACR ALLOWED AN ACFT TO CONTINUE FLYING MULTIPLE OVERWATER LEGS WITH OUT OF DATE NAV DATABASE.

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UPON GETTING THE FLT RELEASE FOR THIS FLT; I SAW THAT THE RELEASE STATED 'FMC DATABASE XX-YY.' I CALLED THE DISPATCHER TO ASK ABOUT THIS. HE INFORMED ME THAT THE DATABASE HAD YET TO BE UPDATED; BUT THOUGHT THAT THE DATABASE HAD BEEN UPDATED EARLIER; AS THE ACFT HAD BEEN ON THE GND MOST OF THE DAY. UPON READING THE LOGBOOK; I VERIFIED THAT THE FMC DATABASE WAS INDEED OUT OF DATE; AND HAD BEEN PLACARDED ON APR/XA. WE COMPLIED WITH THE MEL AND OPERATED THE FLT. FOUR DAYS LATER; WE FLEW THE SAME ACFT FROM ZZZZ BACK TO ZZZ; WITH THE SAME PLACARD. THUS; THIS ACFT HAD MADE 4 OCEAN XINGS WITH AN OUT-OF-DATE DATABASE. IS OUR COMPANY SO STRESSED THAT IT CANNOT ACCOMPLISH UPDATING THE DATABASE WE NAV WITH; USED FOR TERRAIN INFO; ETC? THIS TELLS ME THAT WE ARE SERIOUSLY DEFICIENT WHEN IT CANNOT ACCOMPLISH A VITAL; YET ROUTINE ACTION. WE ARE NOW DOING MORE AND MORE RNAV OPS; YET FOR 4 DAYS THIS AIRPLANE FLEW MULTIPLE INTL FLTS IN THIS CATEGORY. IS THIS TO BECOME THE NORM? THIS PRACTICE IS TOTALLY UNACCEPTABLE.