...must be valid at the time of your distribution. If these instructions, at any time while you are carrying out such distribution, become invalid, you must provide new instructions on demand or cease further distribution. If you provide valid instructions or cease distribution within thirty days after you become aware that the instructions are invalid, then you do not forfeit any of your rights under this license. (6) You may Distribute a Modified Version in Compiled form without the Source, provided...
--Artistic License, Version 2.0. (Paragraph 31.)