Security Firebird use database with .com

Many ways to secure database. Firebird 1.5 allow to set database with alias. we can set this at file aliases.conf. there is in folder C:\Program Files\Firebird\Firebird_1_5.
we open this file and get this sample alias.
# dummy = c:\data\dummy.fdb

Before we write alias name, please open ms dos prompt copy your database into system operation folder c:\windows\ and than rename .
for example
c:\windows\rename data.gdb Data.com
or
C:\windows\rename data.fdb Data.com

So we have new file data.com with format gdb or fdb, every user will think that this file is not file fdb or gdb .

after that we open C:\Program Files\Firebird\Firebird_1_5\aliases.conf

write in it
data=c:\windows\Data.com

and than save this file

How To connect...?

Databasename : Ip:data
or we can use computer name
Databasename :Computer name:data

Data is name alias from data=c:\windows\Data.com