parse for a rel=license link, and if it links to a well known open license like CC, index instructions etc.

[tantek]

It would be great it if the openrecipes spider could check a recipe permalink page for a rel=license link, and if the link goes to a well known open license URL (e.g. creativecommons.org), then index everything about the recipe, including the license, and then provide all of that in the JSON data dump etc.

http://microformats.org/wiki/rel-license