It does not really clear things up for me, sorry. I guess I still see a
PWG standard being based on an element (headers and code) of vendor
product that has origins as GPL code.
Alternatives: While I do not know of "vendor, industry or group
standard" with an acceptable job/"raster" (really, job/image (really,
job/content)) format that is similar to CUPS raster, I would suggest
something like the following.
Format: Job Ticket, <Page Overrides, Page content (image or maybe
something else) ........ n-number of pages>
Job Ticket content == JTAPI from OpenPrinting (CPL License and
completely available to all to use without GPL "hooks" or concerns).
Note JTAPI was derived to be
consistent with IPP!!!
Page overrides == only those JTAPI elements that need individual
page override
Page content == Byte-wise Run-Length compressed "sRGB" or other
image/color-space data format(s). In future, this is extensible to
other data formats that could include vector, jpeg, etc
This has the same objective as CUPS raster but is based on public
standards and code elements that have free licenses. There already
exist CPL based header file for JTAPI job elements and an approved
public standard. The standard provides compliance for mobile, SOHO,
office and production printing domains/applications. This approach could
reduce the 1800 bytes / page overhead of CUPS Raster 2 to a few bytes if
no page override needed (the most likely use case) along with alignment
of other small details in CUPS raster.
Glen
________________________________
From: Michael Sweet [mailto:msweet at apple.com]
Sent: Wednesday, February 02, 2011 12:16 AM
To: Petrie, Glen
Cc: ipp at pwg.org; cloud at pwg.org
Subject: Re: [IPP] New draft of IPP Subset of CUPS Raster (IPP
Raster)specification posted
Glen,
In response to your concerns:
1. PWG Process 3.0
(http://www.pwg.org/chair/membership_docs/pwg-process30.pdf) does not
specify that a PWG standard must be an original creation of the PWG or
that it cannot be based on an existing vendor, industry, or group
standard. In fact, most PWG standards are necessarily based on existing
standards from different sources. That said, if you have an alternative
existing format you would like to propose as an alternative to CUPS
Raster, please do so now.
2. The reference implementation of CUPS Raster is provided under version
2 of the GNU LGPL and nothing would prevent a vendor from doing an
independent implementation under alternative terms. Also, since CUPS
Raster has not been formally included in any PWG standard to date, Apple
naturally has not provided a LOA for that IP (yet).
Hope this clears things up!
On Feb 1, 2011, at 6:24 AM, Petrie, Glen wrote:
I have reviewed the new proposed standard and have two concerns
with respect to the "IPP Subset of CUPS Raster"
1. It was my understand that a IEEE ISTO PWG Standard must
not be the standardization of product or a specific company's
implementation
a. Thus, there is a great need for a PWG IPP Image format or
PWG IPP Raster format; however, I believe that specifying it as a subset
of the specific open-source or vendor product is not in line with PWG
standards practices. This is not to say that is could not have a
normative or informative reference to a specific open-source or vendor
product but it should stand on its own with ties to a specific
open-source or vendor product. Also, it should not use attribute names
or variables that are identified with a specific open-source or vendor
product.
b. I am aware of other entities that wish to use an
established format (i.e. CUPS Raster 2); but if PWG is going to
standardize it, it should be PWG entity.
2. The specific open-source or vendor product that is being
discussed is CUPS. So, the other concern with a standard that directly
references CUPS is that CUPS is licensed by/under Apple and GPL.
a. I have not heard or know that Apple has provided a Letter
of Assurance on the use by others for the use a subset of CUPS
definition. While, I believe that Apple would provide LOA upon request.
b. On the other, if any or part of the content PWG is
proposing to use from CUPS was/is part of CUPS that was/is under GPL
before Apple's ownership; then there is the question if GPL license
applies. Major print vendors may be at risk of either having to release
their source code that is associated with CUPS content or even being
sued by GPL proponents.
Glen
-----Original Message-----
From: ipp-bounces at pwg.org [mailto:ipp-bounces at pwg.org] On Behalf
Of Michael Sweet
Sent: Wednesday, January 26, 2011 11:10 PM
To: ipp at pwg.org
Cc: cloud at pwg.org
Subject: [IPP] New draft of IPP Subset of CUPS Raster (IPP
Raster)specification posted
All,
I have posted a new version of the IPP Raster specification at:
ftp://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippraster10-20110126.docxftp://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippraster10-20110126.pdfftp://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippraster10-20110126-rev.pdf
This version incorporates all of the feedback from the IPP
telecon including the rename from PWG to IPP...
________________________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair
--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
_______________________________________________
ipp mailing list
ipp at pwg.orghttps://www.pwg.org/mailman/listinfo/ipp
________________________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair
--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pwg.org/pipermail/cloud/attachments/20110202/cbcb6027/attachment-0001.html>