Difference between revisions of "Syndication"

License statements may be included in various synication formats, generally at the feed and item level, where the latter overrides the former.

RSS 1.0

http://web.resource.org/rss/1.0/modules/cc/

RSS 2.0

http://backend.userland.com/creativeCommonsRssModule

Atom 1.0

http://ietfreport.isoc.org/idref/draft-snell-atompub-feed-license/

Human-visible notice

Some podcast players display the contents of a copyright element found in a feed. Example usage, not really intended to be machine-parsable, customize for communication with human readers, but do include URL of the relevant CC license and most importantly URL where users can get back to your site:

<copyright>All the songs in this podcast, and the podcast itself, are licensed to the public under http://creativecommons.org/licenses/by-nc-sa/1.0/ verify at http://magnatune.com/info/openmusic</copyright>

Licensed Content Discovery

Not all feeds include license metadata. Heuristics for discovering licensed content. Perhaps useful in particular for aggregators:

• IF feed item contains license reference or feed contains top level license reference
  • THEN content in feed (including images and enclosures) probably licensed
• Crawl feed item URLs.
  • IF license found for feed item URL (e.g., rel="license")
    • THEN content at feed item URL probably licensed
  • IF license metadata found specifically for media (e.g., about an image or video URL)
    • • THEN that media is probably licensed
• Download content referred to (e.g., in enclosure)
  • IF content contains reference to metadata on the web that says content is licensed, content is probably licensed (see Embedded Metadata

This is obviously just a sketch. Aggregators may wish to use different heuristics for different feeds. See Content Curators for some sites with feeds of CC licensed content.