Thank you martin. I read the article from blog below so I think I only have license stack 6.5 so I can install no-enforcement key in earlier version but I could not get other cool feature...
I misunderstood.....
"If your organization isn’t ready to upgrade to Splunk Enterprise 6.5, you can simply upgrade your existing Splunk License Master to benefit from this change."
http://blogs.splunk.com/2016/10/18/splunk-takes-a-flexible-approach-to-license-enforcement-with-splunk-enterprise-6-5/
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