How can I disallow restore from backup on SQL Server? I want to disallow restore from backup. How can I do this? One Of my friends said to me 


  "Take a certificate for your database and anyone cant restore from your backup" 


I searched about certificate but I didn't find anything. I want to be sure that nobody copy my database from backup or the other ways.

Is there anyway about this problem?
Quick answer: You can't. 

Physical access to the backup file will allow someone to restore it. The password feature isn't secure and will be removed anyway. See "Security Considerations for Backup and Restore" on MSDN

To prevent someone running RESTORE and destroying a working database, then ensure that only the correct folk have permissions to do this