[cc-community] How Does Google Index CC-friendly MP3s?
David Delbridge
creativecommons at rigel7.com
Sat Feb 28 14:21:38 EST 2009
Thank you, Mike. This is very helpful.
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?
Again, thank you very much for your kind assistance.
Mike Linksvayer wrote:
> On Fri, Feb 27, 2009 at 6:54 PM, David Delbridge
> <creativecommons at rigel7.com> wrote:
>
>> I'm publishing MP3s on my website for indexing by CC-friendly search
>> engines. How does this work? Neither Google nor Yahoo! describes
>> clearly what must be done to get an MP3 audio file CC-indexed. Does
>> Google, for example, read the MP3 audio file's ID3 frames? Or, does
>> Google index the URN:SHA1 tag (RDFa) embedded in your MP3 audio file's
>> official download page?
>>
>
> No search engine that I know of does CC aware indexing of audio. I
> suspect the first one that does will look at descriptions of http URLs
> returning audio files rather than URNs with hashes of the files. The
> latter is primarily intended for use by P2P clients to verify that the
> URL they have a reference to is talking about the file with the
> reference ... turned out to not be a big use case.
>
>
>> I've studied the example RDFa code fragment on
>> http://wiki.creativecommons.org/Nonweb_Tagging but am confused by the
>> clarifying statement, "This fragment includes the statement
>> <urn:sha1:MSMBC5VE...." Huh?! No it doesn't! Is there a typo here or
>> am I misunderstanding something?
>>
>
> It could be explained much better. Both have the same statement
> (subject, predicate, object), first as RDFa, second as something
> N-Triples like. The page needs to be rewritten for clarity.
>
> See http://www.w3.org/Submission/2008/SUBM-ccREL-20080501/ for a
> longer and hopefully clearer exposition. For a music site, I'd to
> start with recommend simply something like
>
> <div about="http://example.com/foo.mp3">
> <a href="http://example.com/foo.mp3">foo.mp3</a>
> <a href="http://creativecommons.org/licenses/by/3.0/" rel="license">CC BY</a>
> </div>
>
>
--
David M. Delbridge
Circa 3000
ColdFusion Hosting
http://www.circa3k.com
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