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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: read-only overlays (was: 23.0.50;
	delete-seletion-mode and read-only text)
Date: Wed, 23 Jan 2008 16:41:14 -0500
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It is no accident that read-only works only as a text property.
It is tested for in textprop.c only as a text property.

I am not sure that a read-only property on an overlay makes much sense.
It is a strange thing to do.  So I will fix the documentation.