AN ACR TAKES OFF FROM DENVER WITHOUT RECEIVING THEIR RTE CLRNC THROUGH PDC OR VOICE.

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DURING PREFLT AND COCKPIT SETUP; FO REQUESTED ACARS DATALINK PDC (IFR CLRNC). RESPONSE RECEIVED WAS THAT PDC WAS NOT STORED AND TO CONTACT CLRNC DELIVERY BY VOICE. THIS WAS NOT UNUSUAL; BUT DUE TO THE NORMAL SOPS AND A COUPLE OF IRREGULAR PROBS; NEITHER OF US CONTACTED CLRNC DELIVERY FOR THE IFR CLRNC. AT THIS POINT I WAS UNAWARE OF THE ACARS MESSAGE RESPONSE. PROB WAS IDENTED AFTER TKOF WHEN DEN TWR INSTRUCTED US TO SQUAWK XXX (WHICH WAS NOT SET) DURING TAXI-OUT NEITHER DEN GND NOR TWR QUESTIONED OUR IFR CLRNC (OR LACK OF). ONCE THE PROB WAS DISCOVERED; I VERIFIED OUR ALT AND RTE WITH ZDV (WHICH WAS AS FILED AND NOTED ON OUR FLT PLAN FORECAST). NO CONFLICT OCCURRED; NO ALT OR RTE/VECTOR CLRNC WAS VIOLATED. NOTE -- SOMETIMES DURING OUR PREFLT BRIEFINGS; THE IFR CLRNC IS DELAYED AND WE TAKE NOTE OF THAT. THIS TIME HOWEVER IT WAS FORGOTTEN. ALSO; I WAS UNDER THE IMPRESSION THAT GND CTL WOULD HAVE QUESTIONED OUR REQUEST FOR TAXI; HAD THEY NOT HAD OUR CLRNC. SINCE THEY DIDN'T; I'M ASSUMING THEY IN FACT DID HAVE OUR CLRNC; AND ALLOWED US OUR TAXI REQUEST.