C172 DEPING HEF IS ADVISED BY PCT APCH OF DC ADIZ NONCOMPLIANCE REQUIREMENTS PRIOR TO DEP.

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THIS FLT WAS MY SECOND FLT AFTER QUALIFYING FOR MY PP-ASEL LICENSE; ALSO MY FIRST FLT SINCE THE ANNOUNCEMENT OF THE DC ADIZ. THE BRIEFING INCLUDED NOTAMS; INCLUDING THE NOTAM REGARDING THE DC ADIZ. I READ THE NOTAM AND THOUGHT I UNDERSTOOD IT. I THOUGHT I HAD READ THAT A PLANE TAKING OFF FROM WITHIN THE DC ADIZ WAS ABLE TO CONTACT POTOMAC APCH AFTER TAKING OFF. IN HINDSIGHT; IT IS OBVIOUS THAT I DID NOT UNDERSTAND THE PROCS CORRECTLY. THE RECENT CHANGE IN THE APPARENT OPERATING RULES FOR THE ADIZ ADDED TO MY CONFUSION. I LISTENED TO ATIS FOR THE WX AND CALLED MANASSAS GND TO TAXI. THEY DIRECTED ME TO RWY 16R AND ADVISED ME THAT THE POTOMAC APCH FREQ WAS 124.65. AS I TAXIED TO THE RUNUP AREA; I HEARD SEVERAL PLTS TALKING TO MANASSAS GND. IT APPEARED TO ME THAT THEY ALSO WERE CONFUSED ABOUT THE PROC FOR OBTAINING A SQUAWK CODE FROM INSIDE THE DC ADIZ. THE BITS OF CONVERSATION I COULD PAY ATTENTION TO SEEMED TO CONFIRM MY UNDERSTANDING OF MY OPTIONS REGARDING CONTACTING POTOMAC APCH. I RECEIVED CLRNC TO TKOF. TWR DID NOT ASK IF I HAD A CODE. TWR DID NOT PROVIDE A CODE. THE FACT THAT TWR CLRED ME TO TKOF WITHOUT PROVIDING A SQUAWK CODE CONFIRMED IN MY MIND THAT I WOULD BE GETTING THE CODE AFTER TKOF. I TOOK OFF; SQUAWKING. AFTER GETTING TO TFC PATTERN ALT; I TURNED SW AND CONTACTED POTOMAC APCH. I WAS ADVISED I SHOULD HAVE GOTTEN THE CODE PRIOR TO TAKING OFF; POTOMAC APCH THEN PROVIDED ME WITH A UNIQUE CODE. THE CTLR THEN HAD ME COPY A PHONE NUMBER AND DIRECTED ME TO MAKE CONTACT AFTER I HAD LANDED. JUST PRIOR TO GIVING ME THAT NUMBER; POTOMAC APCH GAVE THAT PHONE NUMBER TO ANOTHER PLT. AS I EXITED THE CLASS B AIRSPACE; POTOMAC APCH GAVE ME PERMISSION TO CHANGE FREQUENCIES; AND REMINDED ME TO CONTACT THEM PRIOR TO RE-ENTERING THE ADIZ. WHEN I PREPARED TO RETURN TO HEF AND LISTENED TO ATIS BROADCAST; THE NOTICE ADVISED ALL PLTS TO OBTAIN A UNIQUE SQUAWK CODE PRIOR TO TAKING OFF. THIS WARNING WAS REPEATED TWO OR THREE TIMES EACH BROADCAST. AFTER LNDG AND SECURING THE PLANE; I CALLED LEESBURG FSS AND RELATED A VERSION OF THE STORY.