>i want to encrypt my visual foxpro database so it can't be read by another database program, but i can read it when the table are in encrypted.
>or any of you have a suggestion.

To easily encrypt a whole dbf you could use Cryptor http://www.hallogram.com

To encrypt some fields in a table, you could use the Windows CryptoAPI, through the class provided by VFP7 and up in the Component Gallery.