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Is xvi's license Ok for PPA?


  I'm thinking of starting an Ubuntu ppa for xvi, the smallest
full-feature vi clone - see xvi.sf.net - and wanted to check that its
custom licence is compatible with PPA. It's derived from the Emacs
license in 1991 and reads:
Xvi copying permission notice Copyright (C) 1991,1992 Chris and John Downey.

Xvi is distributed in the hope that it will be useful, but because the
authors do not receive any payment for it, it is provided without any
warranty. No author or distributor accepts responsibility to anyone for
the consequences of using it or for whether it serves any particular
purpose or works at all, unless he/she says so in writing.

Everyone is granted permission to copy, modify and redistribute Xvi
under the following conditions:

        Permission is granted to anyone to make or distribute verbatim copies
        of Xvi source code as received, in any medium, provided that all
        copyright notices and permission and nonwarranty notices are preserved,
        and that the distributor grants the recipient permission for further
        redistribution as permitted by this document, and gives him/her and
        points out to him/her an exact copy of this document to inform him/her
        of his/her rights.

        Permission is granted to distribute modified versions of Xvi source
        code, or of portions of it, under the above conditions, provided also
        that all changed files carry prominent notices stating who last changed
        them and that all the Xvi-derived material, including everything
        packaged together with it and not independently usable, is distributed
        under the conditions stated in this document.

        Permission is granted to distribute Xvi in compiled or executable form
        under the same conditions applying for source code, provided that either

        A       it is accompanied by the corresponding machine-readable source
                code, or
        B       it is accompanied by a written offer, with no time limit, to
                give anyone a machine-readable copy of the corresponding source
                code in return for reimbursement of the cost of distribution.
                This written offer must permit verbatim duplication by anyone.
        C       it is distributed by someone who received only the executable
                form, and is accompanied by a copy of the written offer of
                source code which he/she received along with it.

In other words, you are welcome to use, share and improve Xvi.
You are forbidden to forbid anyone else to use, share and improve
what you give them. Help stamp out software-hoarding!

This copyright notice was adapted from the one supplied with GNU Emacs.

Thanks!  Please Cc replies to me as I'm not subscribed


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