 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 . This study is introduced by the analysis of the simpler case of American options .
<coherence>  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 . This study is introduced by the analysis of the simpler case of American options .
 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 .