Re: books packs (was: Re: The Emacs World (was: Re: how can I convert the To field to CC))

[Jean Louis <bugs@gnu.support>]

* Emanuel Berg via "Emacs development discussions. <emacs-devel@gnu.org> [2021-03-02 07:13]:
> Speaking even more of books,
> 
>   https://dataswamp.org/~incal/#isbn
> 
> and in particular, the two complete packs
> 
>   https://dataswamp.org/~incal/emacs-init/isbn-verify.el
>   https://dataswamp.org/~incal/emacs-init/issn-verify.el

I suggest that you read the GPLv3 by doing C-h C-c the section "How to
Apply These Terms to Your New Programs" and add the proper copyright
notice in accordance with licensing terms of GPL version 3. It is for
your protection and for other people to know what rights they are
getting.

Providing only a notice "License: GPLv3" is not enough.

Let us say it legally, if author did not read the license GPL version
3 than author will not know the licensing terms and the fact that
author did not know the licensing terms is shown by lack of
application of the licensing terms, in this case proper copyright
notice.

Author could as well then say later that he, author, was not aware
that GPL version 3 is free software and that he only gave permission
to download, but not to modify as hypothetical example.

Software may be sold and re-sold and third party could sell the
software to user, and user could claim that if software was sold user
is asking for warranties, could even come to original author by
mistake. If notice about warranties is not displayed it can cause
troubles.

GPL version 3 software is often sold through market places of
freelancers such as freelancer.com or fiverr.com I know that as I have
been selling to clients. Free software is often used in larger
corporate server farms and applications with hundreds or maybe
thousands of customers paying high prices for some functions.

We know you, but the distributors of software will not know the
author, and user will not know what "GPLv3" means itself.