Comment by beshrkayali

I think even with their "permissive usage guidelines" of the OpenSearch trademark, their own way of how they've been doing Amazon ElasticSearch would not be allowed... For example, you can't do: `Microsoft OpenSearch`, you have to do "for OpenSearch" or "with OpenSearch compatibility".

From their "permissive" trademark policy [1]

> You may also use the “OpenSearch” word mark to make accurate statements about compatibility and interoperability using relational phrases such as “works with,” “runs on,” “compatible with,” and the like (e.g., “Foocorp Software powered by OpenSearch” or “Foocorp Software for OpenSearch” or “Foocorp Software with OpenSearch compatibility”).

1: https://opensearch.org/trademark-usage.html