Securing local sql server express MDF/LDF

I am developing a .net application that uses a local sql server express
database. I am concerned about the security of the local database as
the user of the application can navigate to the installation directory
and copy the files.

My question is: How can I secure these files?

My concerns:
1. I have read about EFS and do not think this is a viable solution
when the application is deployed.
2. Encrypting all fields of the database will probably cause too much
overhead in the application. Is there any fast encrypt/decrypt methods
available?
3. Are there any third party tools that can either solve my issue at
either the file level or database field level?

.

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