According to the CreativeWork Schema, "license" is a valid property, but testing the below code with the Google Structured Data Testing Tool renders an error:
Error: Page contains property "license" which is not part of the schema
<span itemscope itemtype="http://schema.org/CreativeWork">
<meta itemprop="genre" content="Travel">
<meta itemprop="isFamilyFriendly" content="true">
<link itemprop="license" content="http://creativecommons.org/licenses/by-nd-nc/1.0/">
</span
Am I to assume that this is a glitch in the testing tool, or that Google ignores the property and it is used elsewhere by other SEs?