 We prove the existence of a cancellation time and a trading strategy for the seller which allow him/her to be super-hedged, whatever the model is .
<clarity>  We prove the existence of a cancellation time and a trading strategy for the seller which allow him/her to be super-hedged, whatever the model is .
 We study the existence of a cancellation time and a trading strategy for the seller which allow him/her to be super-hedged, whatever the model is .