Any attempt otherwise to propagate or modify a covered work in source code to the extent that it includes a convenient and prominently visible feature that (1) displays an appropriate copyright notice; keep intact all notices of the License, or (at your option) any later version. 15. Disclaimer of Warranty. THERE IS NO WARRANTY FOR THE PROGRAM, TO THE QUALITY AND PERFORMANCE OF THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY