ksqlDB Standalone version/package

I notice the ksqldb.io domain now redirects to the confluent site, with the standalone deploy option gone, and mention that ksqldb is a commercial component of the confluent platform. However I’ve seen in the docker components of the confluent platform ksql-server continues to be a Community version. Is the package confluent-ksqldb still maintained? Has it changed to be cp-ksqldb-server and do we need a key to use it?