Here's what mine says on the inside cover, this may clear things up since I got mine in the US.
"This permit is valid in the territory of all Contracting States with the exception of the territory of the Contracting State where issued, for the period of one year from the date of issue, for driving of vehicles included in the category or categories mantioned on the last page of this permit.
It is understood that this permit shall in no way affect the obligation of the holder to conform strictly to the laws and regulations...[blah, blah, blah]..."
You get the idea. It also mention's that you must present your state issued license with the IDL.
IMHO, this sounds like a legimate get rich scam.
BTW, mine wass valid in Afghanistan.