From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Richard Stallman Newsgroups: gmane.emacs.devel Subject: Re: Can watermarking Unicode text using invisible differences sneak through Emacs, or can Emacs detect it? Date: Sun, 23 Jan 2022 23:33:59 -0500 Message-ID: References: <87sftk49ih.fsf@yahoo.com> <837dawt0h4.fsf@gnu.org> <838rv9plyf.fsf@gnu.org> <837dasntoj.fsf@gnu.org> Reply-To: rms@gnu.org Content-Type: text/plain; charset=Utf-8 Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="36863"; mail-complaints-to="usenet@ciao.gmane.io" Cc: psainty@orcon.net.nz, luangruo@yahoo.com, emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Jan 24 05:38:44 2022 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nBr7s-0009TQ-Gc for ged-emacs-devel@m.gmane-mx.org; Mon, 24 Jan 2022 05:38:44 +0100 Original-Received: from localhost ([::1]:49764 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nBr7r-0007Jz-Fo for ged-emacs-devel@m.gmane-mx.org; Sun, 23 Jan 2022 23:38:43 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:41190) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nBr3J-0004qr-9b for emacs-devel@gnu.org; Sun, 23 Jan 2022 23:34:02 -0500 Original-Received: from [2001:470:142:3::e] (port=57932 helo=fencepost.gnu.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nBr3I-0005Jo-Fq; Sun, 23 Jan 2022 23:34:00 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=Date:References:Subject:In-Reply-To:To:From: mime-version; bh=LqpZr0gzHZCX2SvKVDDG2wMtWSbaSY+/TP5imX7AzUg=; b=jNJgyAaoV/Cq CdN6tQTT3x3cP0Srzzi+KAfyxWEXrG+3TcKo8a4g/dFpK9oahGZdZ2ZFqk9V4gfP20WmQmWx/egIN Q+PqeDonx9OX8Zzl45v7DQgEE8TSUvS/elwY3Nb8RFmgPOQzB9j4qC2gzh5l7NZ+nh0jV76p4fcLM JMZw973WuegFaTRvuy/6m8CS+hg/UwLeEg4Op4BmQK1bXpF4p1ZPpxlVQUNRyM4p/xaw68ZZcCWTw 1fuI/hKwIhzKHFcXPDDuRPquCMMIymDrKYyEfLH5PlB7uQwqh55K5anog6GyoHQr7+ke7knVULXTl WbJhfEUM1bdodYpO33MTWg==; Original-Received: from rms by fencepost.gnu.org with local (Exim 4.90_1) (envelope-from ) id 1nBr3H-0002nk-HU; Sun, 23 Jan 2022 23:33:59 -0500 In-Reply-To: <837dasntoj.fsf@gnu.org> (message from Eli Zaretskii on Sat, 22 Jan 2022 08:58:04 +0200) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:285284 Archived-At: [[[ To any NSA and FBI agents reading my email: please consider ]]] [[[ whether defending the US Constitution against all enemies, ]]] [[[ foreign or domestic, requires you to follow Snowden's example. ]]] > We don't have a way of determining whether a terminal can display > ligatures. Could we do it via terminfo? We can define any capabilities we like. > > I doubt any user wants to see a diamond instead of `fi'. > Is this what really happens for you, on your terminal? Yes. A few days ago I put point on a diamond, typed C-u C-x =, and was told it was a ligature for `fi'. I didn't save details of what text I was looking at, but I suspect it was a web page that a script fetched and emailed to me. -- Dr Richard Stallman (https://stallman.org) Chief GNUisance of the GNU Project (https://gnu.org) Founder, Free Software Foundation (https://fsf.org) Internet Hall-of-Famer (https://internethalloffame.org)