Sony DVP NS315 + how to unlock this dbd player ?

Hi,

I've buyed the Sony DVP NS315 dvd player in a FNAC Store in France.
When I buyed it, I've specified to the saler that I was searching for
a multizone dvd player because I live in South America and that I
would like be able to see films from South America Zone and France
Zone.

But, infortunatly, when I came back home, surprise : the dvd player
wasn't unlocked ... and I can only see films from France.

I can't go back to France to reclam to the store and beat the saler,
:-).
But maybe it's simple to unlock this dvd player with a code from the
remote control.

Is there anybody which can help me, please.

Thanks a lot for your help and advices,
See you.
Francisco