I need to restrict [database].MDF file's using on other MSSQL server. HELP!

Hi.
I have a database named SUTDNet on a server on my computer. I created
a few users for this database and i restricted any one's interests for
this database. However, i can't hide my database's datas when anyone
copies SUTDNet.mdf database file from my computer and attaches this
file on other server on other computer. The thief of data file can
enter my computer. When it goes, all user rights for the database on
my server are ineffective on other server.
How do I keep my datas from a theft like copying my data files.
Really appreciate any help and advice offered. Thank you.
Regards
Orgil.Orgil
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"Orgil" <orgilhp@.yahoo.com> wrote in message
news:1174539323.344840.89960@.d57g2000hsg.googlegroups.com...
> Hi.
> I have a database named SUTDNet on a server on my computer. I created
> a few users for this database and i restricted any one's interests for
> this database. However, i can't hide my database's datas when anyone
> copies SUTDNet.mdf database file from my computer and attaches this
> file on other server on other computer. The thief of data file can
> enter my computer. When it goes, all user rights for the database on
> my server are ineffective on other server.
> How do I keep my datas from a theft like copying my data files.
> Really appreciate any help and advice offered. Thank you.
> Regards
> Orgil.
>