With HP SAN additional licenses are required to utilise snapshots and/or replication.

Business Copy does snapshots and comes in 1 TB, 2 TB and unlimited licenses per array. Costs vary but expect to pay between $8000 and $15,000.

Continuous Access does cross site mirroring and comes in  1 TB, 2 TB and unlimited licenses. It requires a license for each site. I haven't seen a quote for these but I would expect they are more the Business Copy.

BTW Licenses are not transferable:

From http://h18006.www1.hp.com/products/storage/software/bizcopyeva/qa.html#13

Q13. Can I move my HP StorageWorks Business Copy EVA Software license to another of the same model?

A13. No, Business Copy EVA Software licenses are non-transferable. If you are upgrading between models, there are license upgrade options available.