Xorg copyright infrigement

Jasper St. Pierre jstpierre at mecheye.net
Tue Apr 29 11:01:14 PDT 2014

The VESA CVT standard is still free, by the way. You can find download
instructions for accessing any VESA public standard here:


On Mon, Apr 28, 2014 at 5:08 AM, Egbert Eich <eich at freedesktop.org> wrote:

> On Sun, Apr 27, 2014 at 12:28:46PM +0200, Mateusz Jończyk wrote:
> > >
> > > The xls however, felt as if it was meant as a reference
> implementation, aimed at
> > > improving the proliferation of CVT. If graham does get contacted, i
> think he
> > > would agree.
> > I don't have any doubts that the Authors of the XLS would agree to
> inclusion of its
> > derivative works in XOrg and other programs.
> > Until that happens, however, we cannot rely on it.
> > >
> > > Now, before we do get access to those documents, how are you intending
> to
> > > circumvent this claimed copyright infringement without infringing
> yourself under
> > > your very strict rules?
> > We could just rewrite it using the Chinese wall principle:
> > http://en.wikipedia.org/wiki/Clean_room_design
> Gentlemen - please get out of this rat hole!
> The implemenation in the X.Org repo - from which other implemenations
> were derived - is not a copy of the code in the spread sheet and
> therefore does not infringe on any copyright held by the author of it:
> the spread sheet is in XLS, the X.Org implemenation is C code:
> The *only* thing in common with the spread sheet is the *algorithm*.
> This algorithm however is a published and publically available VESA
> standard.
> One can obtain VESA standards either
> - by downloading them if they are available for free download (some are)
> - by purchasing them
> - by being a member of VESA.
> The beauty of VESA standards is that they are royalty free: Once one
> has obtained one one can freely implement it.
> In our case here, the algorithm if the CVT standard was published by
> VESA and made available for free download thru the said spread sheet
> (instead of a pdf document).
> So why on earth would anybody now want to do a clean room implemenation
> of a standard that is publically available?
> The *only* thing that should be done is to get rid of the paragraph
> containing the eye-brow raiser term 'stolen' to something saying:
>     This code is an implemenation of the VESA CVT standard.
>     This standard can be obtained from http://www.vesa.org.
> Cheers,
>         Egbert.
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