Download of DbDefence 5.1 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program's installer file is generally known as loader.exe. We recommend checking the downloaded files with any free antivirus. The following versions: 5.1, 2.5 and 2.4 are the most frequently downloaded ones by the program users. This software was originally produced by Activecrypt Software. The program lies within Security Tools, more precisely Antivirus.
From the developer:
DBDefence is the program designed exclusively for SQL Server to protect the database from unauthorized access. DBDefence transparently encrypts the database without modification of your application. DBDefence prevents access to the database tables completely until certain SQL statement with the password. Even DBA can't access tables or execute procedures.
You may want to check out more software, such as MessageLock, SiteAdvisor for Internet Explorer or SOAtest, which might be similar to DbDefence.