second-source definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
of or pertaining to a cooperative arrangement whereby the products, as electronic parts, of one company are also manufactured by another company
second-source - Computer Definition
An alternative supplier of an identical or compatible product. Depending on the product, a second source manufacturer may have a license with the original manufacturer in order to make copies of the device.