Can the off site tape be protected using password?

Hello

I use netbackup 7.5.x and use the Netbakcup Vault option to make a second copy and send the second copy tapes to offsite for storage.

my question is

is there a way to password protect the tapes which are send offsite, reason for this question is " how to protect my data in case some one gets hold of the tapes while in transit"

regards

MBGN