Variable: kill-read-only-ok
kill-read-only-ok is a customizable variable defined in simple.el.gz.
Value
nil
Documentation
Non-nil means don't signal an error for killing read-only text.
Source Code
;; Defined in /usr/src/emacs/lisp/simple.el.gz
;;;; Commands for manipulating the kill ring.
(defcustom kill-read-only-ok nil
"Non-nil means don't signal an error for killing read-only text."
:type 'boolean
:group 'killing)