A buyer filed a breach of contract action against a seller in federal district court. The buyer alleges that the two parties had a contract under which the seller agreed to sell to the buyer a specified number of widgets at a specified price. The seller alleges that the parties had negotiated a possible sale but never reached an agreement. The seller thus denies the existence of a contract. The buyer spent several hundred dollars retrieving from its computer archives the email communication that took place between it and the seller. The buyer intends to use the emails as evidence that the parties did in fact have a contract. The retrieved emails currently are saved on a computer hard drive at the buyer's office. To what extent may the seller obtain discovery regarding the emails