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Automated Content Access Protocol ("ACAP") was proposed in 2006 as a method of providing machine-readable permissions information for content, in the hope that it would have allowed automated processes (such as search-engine web crawling) to be compliant with publishers' policies without the need for human interpretation of legal terms....
...ACAP is a standard proposed by a set of people who are trying to solve the problem [of communicating content access permissions]. We have some people working with them to see if the proposal can be modified to work in the way our search engines work. At present it does not fit with the way our systems operate."
No non-ACAP members, whether publishers or search engines, have adopted it so far.
Seeing how Eric Schmidt made that comment in 2008, I wonder what their current policy is?
Integrating ACAP into existing web sites is trivially easy for publishers, but... poses some serious implementation challenges for search engines.
As a voluntary standard, ACAP will undoubtedly fail unless it is completely overhauled to simplify implementation and provide a better balance between the privileges it apportions between search engines and publishers.