Developer discussion for Creative Commons technology and tools

["Luke Hoersten" <luke.hoersten AT gmail.com>]

Jon and everyone else involved,
I'm very excited about CC EXIF. I've set up cc-sharp
(http://wiki.creativecommons.org/cc-sharp) in a way that a file path,
license URL, and metadata URL can be passed to the library and it will
verify the license claim. This way programs like f-spot
(http://f-spot.org/) will be able to verify license claims with the
exact same code that Banshee (http://www.banshee-project.org/) uses to
verify mp3s. As of now it looks like all your suggestions, Jon, can be
narrowed down to a 3 part "file, license URL, and metadata URL"
verification process and I'm just wondering if a standard
file-type-less verification algorithm (api) exists or if we can set
one up?

-Luke

On 8/8/06, Jon Phillips <jon AT rejon.org> wrote:
> On Sun, 2006-07-30 at 19:35 -0700, Mike Linksvayer wrote:
> > One of the http://wiki.creativecommons.org/Summer_of_Code_2006_Projects
> > is addressing EXIF, though I haven't seen the code yet...
>
> I created a page for those interested in getting and putting metadata
> into the filetypes which use Exif:
>
> http://wiki.creativecommons.org/Exif
>
> There are a gazillion tags
> (http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/index.html) for
> Exif metadata, so we need to pick a solid approach for pushing Exif
> support to the 30 file formats that allow one to use Exif metadata.
>
> After looking at the file list, one can see that support for Exif is
> pretty major (more than id3) and there are tools, like exiftool
> (http://www.sno.phy.queensu.ca/~phil/exiftool) which allow people to
> embed and retrieve Exif metadata in quicktime, mp4, tiff, etc.
>
> It looks like there are a several tag types with the basic Exif types
> and then extended sets such as XMP. I think we should promote both using
> the standard and XMP metadata types.
>
> I think the best way to support Exif metadata is to use the XMP:cc and
> XMP:dc (dublin core) tags to support metadata in a similar way as we do
> with XML. What do you all think?
>
> Also, I think supporting the standard Exif metadata tag "Copyright",
> which is a string would be important as well:
>
>     0x8298 Copyright string IFD0
>
> And possibly the Comment type as well:
>
>     0x9286 UserComment undef ExifIFD
>
> And, optionally, maybe we should promote adding the nonstandard XP
> fields so that this metadata is available in Windows XP and greater:
>
> 0x9c9b XPTitle undef IFD0 (tags 0x9c9b-0x9c9f are used by Windows
> Explorer; special characters in these values are converted to UTF-8 by
> default, or Windows Latin1 with the -L option. XPTitle is ignored by
> Windows Explorer if ImageDescription exists)
>
> 0x9c9c XPComment undef IFD0
>
> 0x9c9d XPAuthor undef IFD0 (ignored by Windows Explorer if Artist
> exists)
>
> 0x9c9e XPKeywords undef IFD0
>
> 0x9c9f XPSubject undef IFD0
>
>
>
> Thoughts?
>
> I'm also cc'ing Hubert Figuiere, who has worked on this filetype
> extensively. Hubert, could you help us find out the best way to embed
> licensing using Exif? These resource might exist, but hopefully you can
> help us find them.
>
> Jon
>
> > On Mon, 2006-07-31 at 00:28 +0200, Jaime Frutos Morales wrote:
> > > I'm new to this list, so hi you all!
> > >
> > > I've searched the wiki for an EXIF metadata specification but I
> > > haven't found any. Do you have any standard way of embeding CC
> > > licenses in EXIF metadata?
> > >
> > > There is a "Copyright" field which could be used to embed the CC
> > > license. Any comments about this?
> > >
> > > I'm interested in this because I'm planning to write a patch for EOG
> > > (Gnome's image view program) to support CC licenses. At the moment,
> > > I've only found an image metadata specification for SVG (and possibly
> > > EXIF). Is there any other image format which supports embedded CC
> > > licenses?
> > >
> > > Thanks.
> --
> Jon Phillips
>
> San Francisco, CA
> USA PH 510.499.0894
> jon AT rejon.org
> http://www.rejon.org
>
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>
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>
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--
Luke Hoersten
http://www.openradix.org/
http://www.cs.purdue.edu/~lhoerste/