Is the ability to do "field-level" encryption free in Enterprise Edition?

We are in the process of upgrading most of our databases to 8.1.7.1
(Enterprise Edition) on Sun Solaris 2.6.

We need to be able to do field-level encryption of some of our data. I think that we should be able to
do so with DBMS_OBFUSCATION. Is DBMS_OBFUSCATION free with 8.1.7.1 Enterprise Edition?

Are there other standard methods/tools that we can use within Oracle to do this field-level encryption?
If yes, are they free or part of an add-on bundle? If add-on, which add-on?

I've been trying to research this on Technet but having difficulty correlating functionality with cost.
My boss wants the answer today so I thought I'd throw it out to the crowd.

Thanks in advance,

Cherie Machler
Gelco Information Network

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