Amit,
For a DR/HA/backup IQ site, you will need SF (standby/failover) licenses. If IQ was bought from SAP those should be included. If you purchased IQ from Sybase then the SF licenses are fee based.
Internal to IQ, a DR site can be created by simply using the BACKUP and RESTORE commands. You would BACKUP the IQ primary, copy/ftp the files to the DR site, then perform a RESTORE. This can be will full or incremental backups.
Most customers leverage something we call Nonstop IQ. In this model, we leverage storage level replication to maintain the primary and secondary IQ sites.
In any scenario, the secondary site is not up and running. There are some situations where we can start the secondary site to performa some actions, but this is very rare and requires intimate knowledge of the underlying storage and its replication technology. Some storage systems would overwrite the copy while others would fork a temporary copy and remove it once the task was done.
The SF licenses only allow for the secondary site to be used when the primary site is down. If you want to use both sites for queries, then they would both require production licenses.
There is no need to maintain licenses in the manner you describe. When the secondary site comes online, it will use the SF licenses. The production licenses are still tied to the primary systems. If you wish to move the production instance back from the secondary to the primary site, the licenses are in place. If the primary site is down and must be completely rebuilt, simply check in the licenses and check them out for the new primary site. This would be a rare occurrence, though.
Mark