Couchbase Server comes in two editions: Enterprise Edition and Community Edition. You can find details on the differences between the two and licensing information on the Couchbase Server Editions page.
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Enterprise Edition -- The Enterprise Edition license provides for free for development and testing for Couchbase Enterprise Edition. A paid subscription for production deployment is required. Please refer to the pricing page for details on Couchbase’s Enterprise Edition.
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Community Edition -- The Community Edition license provides for free deployment of Couchbase Community Edition for departmental-scale deployments of up to five node clusters. It has recently been changed to disallow use of XDCR, which is now an exclusive Enterprise Edition feature.