GA SMA UNAUTH PENETRATION OF SAN TCA.

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ON PREVIOUS FLT SAME DAY; COAST APCH CTL ASKED ME TO MAINTAIN 2000' ALONG COASTAL ROUTE DUE TO AIR SHOW GOING ON AT EL TORO. THIS POSSIBLY LED TO CONFUSION REPORTED. ON DEP FROM MYF; PLANNED TO CLIMB TO 4500' NBOUND UP COAST; BUT LEVELED AT 2000' TO GET PERMISSION FROM SAN DIEGO DEPT CTL (ALSO MIRAMAR) TO FURTHER CLIMB (WORRIED ABOUT AIR SHOW). WAS IN CONTACT WITH SAN DIEGO DEP AND ASSIGNED A TRANSPONDER CODE AND TOLD TO WAIT 'FOR TWO MINUTES' AS THEY WERE BUSY. WHEN THEY CALLED BACK AND VERIFIED ALT; THEY SAID WE WERE IN THEIR TCA AND TO CALL WHEN ON THE GND. I CALLED THE SUPERVISOR AND HE AND I DISCUSSED IT. HE SAID HE WOULD 'NOT WRITE THIS UP.' I MAY HAVE STRAYED INTO THE TCA BUT THOUGHT I WAS IN RADAR AND RADIO CONTACT ETC AND WAS BEING CTLED. AM FILLING THIS NASA REPORT IN CASE THE CTLRS INVOLVED HAVE A CHANGE OF HEART AND DO FILE A REPORT. LESSON LEARNED; DON'T ENTER A TCA EVEN IF YOU HAVE A SQUAWK AND ARE TALKING TO THEM; DON'T ASSUME YOU HAVE CLRNC. MAKE THEM TELL YOU THAT YOU ARE CLRED INTO TCA.