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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Question about copy-region-as-kill
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    Does it ever make sense to consider read-only as a property of text--any 
    text at all?  If not, perhaps read-only should not be a text property, 
    but an overlay.

It might work ok to use overlays always for read-onliness,
but I see no a priori reason it should never be a text property.