discussion of the Creative Commons Metadata work

["Nathan R. Yergler" <nathan AT yergler.net>]

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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