Netbackup License questions?

A few Netbackup license questions. Hopefully someone can clear me up. Thanks advance.

1. For enterprise disk, how do we count the data capacity? do we only count the one full backup data or everything we backed up?

2. If we bought SSO license for drives, will we still need standard library based drive license?

3. what kind of license  do we need for "basic disk"? i heard it has been changed to "enterprise disk".

4. what kind of license do we need for "vault"?

5. we use tape drive based encryption but netbackup key management, will we need any license for this?