Amazon's OpenSearch fork uses the Developer Certificate of Origin (DCO) instead of a Contributor License Agreement (CLA). The DCO, originating from the Linux kernel project, lets contributors license their work under the project's existing open source license while retaining their copyright — unlike a CLA, which grants maintainers the ability to relicense contributions under proprietary terms in the future. This is exactly what Elastic did, betraying its community. The DCO is presented as a better alternative for projects concerned about contribution copyright, and contributors are encouraged to avoid signing CLAs.
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