[andrenotgiant]

Thanks! To answer your question:

The core components of Materialize have always been licensed under the BSL [0], with a conversion to the Apache v2.0 License four years from the date of publication. These components (now called the storage, compute, and adapter layers) continue to be developed in the open under the same license, but are no longer packaged or supported for on-premise deployment.

Timely Dataflow and Differential Dataflow [1] are the open source frameworks that have always been at the heart of the compute layer in Materialize.

If you're referencing the downloadable binary when you mentioned "the open-source version", we decided the opportunity cost of splitting our attention and continuing to release updated binary versions by "rebundling" Materialize is too high. We have a small team and ambitious plans for Materialize, (maybe some `WITH RECURSIVE`?) so we don't plan to release updates to the binary.

[0] https://github.com/MaterializeInc/materialize/blob/main/LICE... [1] https://timelydataflow.github.io/differential-dataflow/intro...