Linux under SecureDrive partition?

1. Where can I get the latest/greatest copy of SecureDrive? (I'm a U.S. resident). 2. Can I install Linux underneath a SecureDrive partition -- say, DOS on C:, Linux under SecureDrive under D: and the Linux swap also under SecureDrive. So that the C: DOS partition is in the clear, and all the good stuff running under Linux is hidden on D:. Much thanks.