Hi Linda,
You may want to have a look at the metadata security side of things. There is documentation on this area in:
http://support.sas.com/documentation/configuration/bisecag.pdf
You will be able to deny/ grant read metadata privileges to groups and hence prevent people from seeing the stored process.
You may want to also consider using operating system permissions to prevent people accessing the relevant .sas file as well. Metadata permissions may be sufficient however the metadata permissions should be seen to sit on top of other layers of permissions such as the operating system and database and hence should go hand in hand.
cheers,
Alan
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