CL601 CAPT TOOK DEP CTL REQUEST LITERALLY; RESULTING IN EXCEEDING THE MAX AIR SPEED LIMITATION BELOW 10000 FT. DEP CTLR ASKED FOR THE RPTRS BEST SPEED IN DEP CLIMB.

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AFTER TKOF FOR HPN ON 9/WED/01; THE 'TWR' CTLR INSTRUCTED ME TO TURN LEFT TO A HEADING OF 295 DEGS. THIS WAS AT AN ALT OF APPROX 50 FT. THE DEP (SID) INSTRUCTIONS ARE TO WAIT UNTIL 1000 FT. I COMPLIED WITH THE INSTRUCTIONS FOR A TURN AFTER REACHING 400 FT AGL AS THIS IS WITHIN OUR COMPANY OPERATING PROC (NO TURN BELOW 400 FT AGL). AFTER MAKING THIS TURN; THE TWR'S INSTRUCTIONS WERE TO SWITCH TO DEP FREQ. UPON CONTACT WITH DEP CTL; HIS INSTRUCTIONS WERE TO FLY A HEADING OF 295 DEGS WITH 'BEST FWD SPEED.' WITH THE AIR TFC CONGESTION ON THE RADIO; THE CADENCE OF THE INSTRUCTION; THE PROXIMITY TO NEW YORK CITY; I INTERPRETED HIS INSTRUCTIONS TO ELIMINATE THE SPEED RESTRICTION OF 250 KTS BELOW 10000 FT MSL. I THEN ACCELERATED NEAR OUR ACFT VMO FOR THE ALT I WAS AT. THIS SPEED WAS APPROX 290 KTS IAS. AS WE RAPIDLY EXITED THE CLASS B AIRSPACE; DEP INSTRUCTED US TO TURN RIGHT TO A HEADING THAT WAS NOW PLACING US ON A NORTHERN COURSE TOWARD OUR DEST. AFTER FURTHER REVIEW OF THIS CIRCUMSTANCE; AND REVIEW OF FAR 91.117; I HAVE INTERPRETED THE REGULATION TO READ THAT ATC IS NOT AUTHORIZED TO ALLOW ME TO EXCEED 250 KTS UNLESS AUTHORIZED BY THE ADMINISTRATOR. DUE TO THE WORLD EVENTS AT THE TIME OF THIS EVENT; I WAS CONVINCED THAT THIS INSTRUCTION WAS NEEDED FOR ATC TO KEEP THEIR AIRSPACE CLR AND SECURE.