Re: What OS is used By Richard Stallman

[Barry Margolin]

In article <mailman.1270.1537850586.1284.help-gnu-emacs@gnu.org>,
 microsoft gaofei <wangziheng@outlook.com> wrote:

> https://www.gnu.org/philosophy/categories.html    . You said, some private 
> software is also free and isn't released to public domain. Can that be free 
> and closed-source at the same time?

"Public domain" means that it's not protected by copyright. Not being 
public domain is not the same as being closed-source.

In particular, the GPL makes use of copyright to make sure that the 
software remains free. The copyright specifies that you may only copy 
the program if you agree to the license, which requires you to make 
source code available.

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
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