I amVery much Beginner to SQLITE, i have very simple query:- How to password protect the db file.
There is no simple method to just password protect the database. If you want to protect the database you should consider encrypting it.
You can buy the encryption extension from hwaci (http://www.hwaci.com/sw/sqlite/prosupport.html) to fully encrypt the database
or you can use tools like http://www.voidbrain.com/sqlitesec.html (which does the encryption very similar to the official encryption extension)
or you can search for other encryption support -> google
A good starting point is also the mailing list archive of this list..., e.g. http://www.mail-archive.com/sqlite-users%40sqlite.org/
Marcel