protect is used to prevent names from being modified either in an interactive session, user or library code. Most of the names initially known to Maple are protected by default.

protect has no effect on environment variables.

unprotect may be used to override the protection on a name. It is not recommended to use unprotect to modify Maple system names.

Error, attempting to assign to `Pi` which is protected

Error, attempting to assign to `foo` which is protected

Error, attempting to assign to `2` which is protected

Error, attempting to assign to `1` which is protected