I dont know whether it is allowed or not but covered call writing is the most conservative of all options strategies. the stock holder (participant) is simply selling an option on stock that he has in his account. he gets a premium and the purchaser of the option makes a bet that the stock is going to go up. if it does, the holder of the option gets to buy the stock from the option writer (participant). thus, the writer of the option (participant) is only losing what he would have made from the upside move in the stock. if the stock does not move, the participant keeps the stock and the option premium.