How restore an encrypted backup from an external client and tape

Hi.

We need to restore a backup executed in an external Veritas Enterprise Server 6.5.5 platform,in our platform (with the same version of Veritas).

This backup was encrypted and the tape used is valid for our backup robot (and LTO-3 tape).

The backup was done for a client machine that doesn't exist nowadays in our platform.

1. It's possible to restore this encrypted backup in our platform using this tape?.

2. How could we restore it?, what steps should be done and how?.

Any help on this?

Thansk in advance.