... (i) If you have modified the Program, you must cause the Work to carry prominent notices stating that you have modified the Program's files and the date of any change. In each source file that you have modified, you must include a prominent notice that you have modified the file, including your name, your e-mail address (if any), and the date and purpose of the change; (ii) You must cause the Work to be licensed as a whole and at no charge to all third parties under the terms of this License;...
--Aladdin Free Public License (AFPL), Version 9. (Paragraph 20.)
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