And the latest is ...
Data Recovery Environments using Copying, Synchronizing or Mirroring Standby and Remote Mirroring are commonly used terms to describe these methods of deploying Data Recovery environments. In these Data Recovery deployments, the data, and optionally the Oracle binaries, are copied to another storage device. In these Data Recovery deployments all Oracle programs that are installed and/or running must be licensed per standard policies documented in the Oracle Licensing and Services Agreement (OLSA). This includes installing Oracle programs on the DR server(s) to test the DR scenario. Licensing metrics and program options on Production and Data Recovery/Secondary servers must match.
Servers – Disaster Recovery Rights: For each Instance of eligible server software Customer runs in a Physical OSE or Virtual OSE on a Licensed Server, it may temporarily run a backup Instance in a Physical OSE or Virtual OSE on either, another one of its Servers dedicated to disaster recovery, or, for Instances of eligible software other than Windows Server, on Microsoft Azure Services, provided the backup Instance is managed by Azure Site Recovery to Azure. The License Terms for the software and limitations apply to Customer’s use of the backup Instance.
If its not specifically called out in the VMware Product Guide it will need licensing, and that means everything other than Continuent and vRelaise for Log Insight. Surprisingly, VMware deem an install to be 'use' of the software - yep - just binaries sitting on a disk.
RHEL Linux Subscription Guide: Cold backups: The server has software installed and configured, but it is turned off until the disaster occurs or for periodic disaster recovery procedure tests. For Red Hat Enterprise Linux, this means that the customer is allowed to preload the bits as a courtesy. However, Red Hat Content Delivery Network cannot be used to update the system until the disaster happens. Then, the paid subscription on the failed machine transfers to the cold backup sever. In this case, a customer does not need two subscriptions. The customer will consume only one subscription at any point in time. Red Hat will allow the customer to pre-provision the software bits onto the cold backup machine as a courtesy. If a customer is found to be running more units of Red Hat Enterprise Linux than the customer has subscribed for because the customer has found a use for these pre-provisioned servers other than this cold backup use case, the customer is obligated to pay Red Hat.
Backup Use Defined: For programs running or resident on backup machines, IBM defines 3 types of situations: “cold”; “warm”; and “hot”. In the “cold” and “warm” situations, a separate license for the backup copy is normally not required, no additional charge applies, and IBM does not need to be notified. In a “hot” backup situation, the customer needs to acquire another license. All programs running in backup mode must be under the customer’s control, even if running at another enterprise’s location.