Oracle Label Security installed ?

Hi all !
How could I know if Oracle Label Security is installed on my 8.1.7.0 database (on Solaris 8) ?

I have to install the 8.1.7.4 patch set, and the patch set notes says :
"If you have previously installed Oracle Label Security then add object files to library. This step is necessary because the installation of this patch set removes Oracle Label Security object files from RDBMS library."

So I just want to know if the Oracle Label Security was installed.
Thanks a lot in advance ...

I think you can look in the DBA_REGISTRY view to see if the packages have been installed.

Regards

Was the LBACSYS schema created?