... a) You must insert a prominent notice in each modified file stating how and when you changed that file. b) You must make such modifications Freely Available as a whole to all third parties under the terms of this License, such as by offering access to copy the modifications from a designated place, or distributing the modifications on a medium customarily used for software interchange. c) If the modified fonts normally reads commands interactively when run, you must cause it, when started...
--Arphic Public License (APL), Version 1.0. (Paragraph 16.)