Any Weblock enables you to block access to specific web sites. Just enter the domain name of the site to block, apply the changes, and the user will no longer be able to access the site. There is no block message displayed, the simply appears to be unavailable. The interface can be password protected, but since the program uses the Windows HOSTS file to redirect blocked sites, it can be easily bypassed by a tech savvy user.
The license of this software is Freeware, you can free download and free use this parental control software.