Technical details such as Copyright, Trademark, Library of Congress Control Number, P-CIP data, ISBN, and EAN or UPC bar codes are important things to think about when self-publishing your book. If your sights are set on a regional or national market with distribution to major retail chains and bookstores, you will find these items are necessary before buyers or distributors will purchase your books. Local or independent bookstores may or may not require these items; it’s always best to check with them first. We list websites to help you determine what you need to meet your distribution goals. See below for more details.