Re: G7 method NPDC calculations
Re: G7 method NPDC calculations
- Subject: Re: G7 method NPDC calculations
- From: Graeme Gill <email@hidden>
- Date: Fri, 12 Dec 2008 02:29:15 +1100
Terence Wyse wrote:
Roger, are the actual G7 NPDC *calculations/algorithms* in the public
domain or simply the graphs illustrating the tone curves?
Perhaps this is relevant <http://www.idealliance.org/IDEA_IP_Policy.pdf>.
From that it appears Don Hutcheson granted to IDEAlliance intellectual
property rights, free of charge, for all non-commercial purposes. It's
unclear what rights if any Don actually claims, or whether such an agreement
was exclusive to the IDEAlliance.
The G7 "How To" document that seems to form the reference for the process
(and which I understand was derived Don Hutcheson's original) has the
following copyright notice:
This document and translations of it may be copied and furnished to others,
and derivative works that comment on or otherwise explain it or assist in
its implementation may be prepared, copied, published and distributed, in
whole or in part, without restriction of any kind, provided that the above
copyright notice and this paragraph are included on all such copies and
derivative works. However, this document itself may not be modified in any
way, such as by removing the copyright notice or references to IDEAlliance,
except as needed for the purpose of developing IDEAlliance specifications,
in which case the procedures for copyrights defined in the IDEAlliance
Intellectual Property Policy document must be followed, or as required to
translate it into languages other than English. The limited permissions
granted above are perpetual and will not be revoked by IDEAlliance or its
successors or assigns.
which is not public domain, but is certainly a "free use" type of copyright license.
There are some interesting disclaimers in the G7 amendment documents too
(what I would interpret as "but we don't know if anyone has a patent claim
on some of this" type disclaimers).
Graeme Gill.
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