>1- is it possible password protect DBF ?

Yes, with a product like Cryptor.



>2- is it possible to pack DBF so user can not edit/danify them ?

Not really. DBFs are simple Windows files. They can be fairly easily damaged or modified, even using tools other than FoxPro (like Notepad, or Excel). If you want real security, I would suggest you migrate your data to a database server (e.g. SQL Server).