The package provides macros \DeclareRobustActChar and \ReDeclareRobActChar. One uses \DeclareRobustActChar in the same way one would use \DeclareRobustCommand; the macro \protects the active character when it appears in a moving argument.

\ReDeclareRobActChar redefines an active character previously defined with \DeclareRobustActChar, in the same way that \renewcommand works for ordinary commands.

The authors are Yvon Henel and Josselin Noirel. The package is Copyright © 2004,2008 Josselin Noirel and Yvon Henel.