NEW YORK (AP) — Oracle Corp. received another setback Thursday as a federal judge in San Francisco undermined a central part of the company's multimillion dollar case against Google Inc. over its Android software for mobile devices. Oracle had accused Google of copyright infringement in using "application programming interfaces," or APIs, that help Oracle's Java software work effectively. A jury found Google infringed on those APIs on May 7, but it couldn't agree on whether Google was covered under "fair use" protections in U.S. law.