These are "Permanent" stickers
These are for PERMANENT use and the adhesive is not supposed to allow them to be taken off once they have been applied. That doesn't mean it is impossible to remove them, but I would not advise you try to do so or there is a strong possibility that you could damage the helmet.
This does give you a dilemma as to whether to fit them or not, but Drive-France cannot take any responsibility if you try to remove them after your trip and damage your helmet.