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cc-metadata - Re: Tagging PNG files?

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Subject: discussion of the Creative Commons Metadata work

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  • From: "Nathan R. Yergler" <nathan AT yergler.net>
  • To: discussion of the Creative Commons Metadata work <cc-metadata AT lists.ibiblio.org>
  • Subject: Re: Tagging PNG files?
  • Date: Sun, 07 Nov 2004 18:46:58 -0500

Sounds like an interesting idea; is there a reason to define a new chunk
type (ccMd) instead of using a tEXt chunk with the specification defined
'Copyright' keyword (http://www.w3.org/TR/PNG/#11Chunks)?

Nathan R. Yergler
Software Engineer
Creative Commons

On Sun, 2004-11-07 at 18:31 -0500, David Wendt wrote:
> After reading some parts of the W3C's spec for PNG, it seems easy enough
> to create a chunk for licence metadata that could then easily fit into a
> PNG file (photo, webcomic) for tagging files. The contents of the chunk
> would be the same as the mp3 data, although if you really wanted we
> could stick some RDF in there.
>
> How to encode metadata: The chunk will be an ancillary private
> safe-to-copy chunk named ccMd (the capitalization is important) that
> will contain data in the format used for MP3-tagging:
>
> [copyright notify] [license url] verify at [claim url]
>
> The 2 important URLs are next to the words 'verify at', that is, the URL
> to the left of 'verify at' is the licence URL, the right of 'verify at'
> is the claim url. The software will then check the claim url for the
> verifing RDF, checking it against the licence referred to in the licence
> url.
>
> It's important you read and understand part 5 of the W3C PNG spec:
>
> http://www.w3.org/TR/PNG/#5DataRep
>
> Read that entire part, it will show you what I'm talking about.
>
> Comments, critiques, flames?
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