HELI PLT OPERATES WITHIN DDC CTL ZONE IN BELOW VMC WITHOUT CLRNC.

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I GAVE A SHORT DEMONSTRATION FLT TO THE PERSON THAT ASSISTED ME IN MOVING THE ACFT. ON A REGULAR BASIS I OPERATE OUT OF TWO DIFFERENT ARPTS WHICH BOTH HAVE INST APCHS; BUT NEITHER ONE HAVE A CTL ZONE. (EITHER PART TIME OR FULL TIME). THERE ARE AT TIMES FLTS CONDUCTED IN THE TFC PATTERN AT THESE ARPTS WHEN WX IS BELOW VFR MINIMUMS. I AM ALWAYS AWARE; AND MONITORING THE FREQ AND GIVING POS RPTS (AS I DID DURING THIS SITUATION) WHILE OPERATING AT THESE LOCATIONS. WHEN THE EVENT OCCURRED I WAS RETURNING TO THE ARPT AND WAS INFORMED BY A COMMUTER PLT THAT I SHOULD CONTACT CTR ABOUT OPERATING IN A CTL ZONE WITHOUT A CLRNC WHEN IT IS BELOW VFR MINIMUMS. I IMMEDIATELY LANDED. REALIZING THE MISTAKE; I CONTACTED CTR VIA FSS AND RECEIVED A SPECIAL VFR CLRNC AND DEP THE CTL ZONE THEN REPORTED CLR; AS INSTRUCTED. I AM WELL AWARE OF THE REQUIREMENTS TO ESTABLISH A CTL ZONE AS WELL AS WHAT THE REQUIREMENTS ARE TO OPERATE INTO OR OUT OF THE SAME. I THINK BECAUSE OF MY REGULAR OPS FROM AN ARPT WITHOUT A CTL ZONE; LED ME TO THINK THAT'S WHAT I WAS DOING WHEN THIS EVENT OCCURRED.