[cc-community] How Does Google Index CC-friendly MP3s?

Mike Linksvayer ml at creativecommons.org
Sun Mar 1 13:04:24 EST 2009


On Sat, Feb 28, 2009 at 11:21 AM, David Delbridge
<creativecommons at rigel7.com> wrote:
> So, what is the point of SHA1 hashes (described in both
> http://www.w3.org/Submission/2008/SUBM-ccREL-20080501/ and
> http://wiki.creativecommons.org/Nonweb_Tagging)?  I now understand how
> MAGNET links utilize the hash to locate a file by name on the Gnutella
> network, for example.  But then, as I understand it, CC suggests that an
> SHA1 hash is useful for verifying an audio file's (or any file's)
> authenticity.  [The Embedded Metadata example
> (http://wiki.creativecommons.org/Embedded_Metadata) also speaks of a
> "verification" page, but (for simplicity, I presume) breezes over the
> RDF and presents no screenshot of the verification page.  Would a hash
> appear on this page in human-readable form?  In the RDF?]
>
> In other words, am I correct in presuming that there is a reason to
> display, in human-readable form, the MP3 audio file's SHA1 hash on its
> official verification page?  If not, and the hash is useful only in
> machine-readable form, then how might this hash be used by
> third-parties?  What is the intended application?  Indexing?

Ideally it would be in human readable and machine readable form (ie
marked up with RDFa).

The intended application was to tie files (which might be found via
P2P filesharing, or just downloaded from a web page and on your disk
with no way to find out where they came from) to a web page. See
http://lists.ibiblio.org/pipermail/cc-metadata/2003-May/000111.html
for the original explanation (the fields and markup to use have
changed since then).

As I said, this turned out to not be a big use case for now, but if
you're tagging MP3s or similar as part of your processing and
generating hashes, eg for MAGNET links, it would be a trivial addition
to follow the protocol. I'd be happy to give feedback on your
implementation.

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