Security in StrataFrame is made easy through the Role Based Security module.
There is a very good overview at the website at the link http://www.strataframe.net/rolebasedsecurity.aspx
I think you could start from this point and then we can help you through the process.
Cheers!
http://www.lespinter.com/FoxToNet/ShowArticle.aspx?ArtNum=412 Russ Brown (Using C#2010/SQL Server 2008)
http://forum.strataframe.net/Topic14216-26-1.aspx