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Subject: RE: RE: [Tiff] Re: LZW Patent
Date: Tue, 24 Aug 2004 15:40:01 +0100
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Thread-Topic: RE: [Tiff] Re: LZW Patent
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From: "Patrick Harris" <patrickh@cre8tiv.com>
To: <stefan.wanger@online.de>
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Stefan,
	Our reading of this allows the use of LZW without licence in
countries where the patent has expired. If you export to a country where
it the patent is still in force then we believe a licence is still
required and it would be advisable to contact Unisys.

As to differences between commercial and non commercial software I
couldn't say.

	Patrick

-----Original Message-----
From: stefan.wanger@online.de [mailto:stefan.wanger@online.de]=20
Sent: 24 August 2004 15:20
To: Patrick Harris
Cc: Frank Warmerdam; stefan.wanger@online.de; tiff@remotesensing.org
Subject: Re: RE: [Tiff] Re: LZW Patent


Thanks.

But I'm not sure.

Does that mean that i can use LZW or not! Or do i have to ask unisys?
Are there differences in commercial and non-commercial software?=20


Thanks to all for more answers.

Stefan


Patrick Harris <patrickh@cre8tiv.com> schrieb am 24.08.2004, 16:08:37:
> Stefan,
> 	Unisys has a details page for the LZW patent at
> http://www.unisys.com/about__unisys/lzw/ which contains details of the
> expiry dates for several of the patents and contact details.
>=20
> 	Patrick
>=20
> -----Original Message-----
> From: tiff-bounces@remotesensing.org
> [mailto:tiff-bounces@remotesensing.org] On Behalf Of Frank Warmerdam
> Sent: 24 August 2004 14:51
> To: stefan.wanger@online.de
> Cc: tiff@remotesensing.org
> Subject: [Tiff] Re: LZW Patent
>=20
> stefan.wanger@online.de wrote:
> > Hi,
> >=20
> > i want to use LZW Kompression in TIFF Files. I am using libtiff to
> > generate TIFF files.
> >=20
> > Can use please tell me under which circumstances i can do this?
>=20
> Stefan,
>=20
> I doubt you will get a valid legal opinion from anyone on this list.
> The
> general impression is that the LZW patent has expired in most (if not
> all)
> countries and for that reason we have re-enabled LZW compression by
> default
> in libtiff.
>=20
> So, as far as I know it is ok, but you are the one taking the risk.
>=20
> Best regards,
> --=20
>
---------------------------------------+--------------------------------
> ------
> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam@pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for
Rent
>=20
> _______________________________________________
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