

If you choose Allow, OS X signs the application and automatically adds it to the firewall list. If you run an unsigned app that is not listed in the firewall list, a dialog appears with options to Allow or Deny connections for the app. Apps included in OS X are signed by Apple and are allowed to receive incoming connections when this setting is enabled. For example, since iTunes is already signed by Apple, it is automatically allowed to receive incoming connections through the firewall. Applications that are signed by a valid certificate authority are automatically added to the list of allowed apps, rather than prompting the user to authorize them. You can also remove any apps listed here that you no longer want to allow by clicking the Remove App (-) button.
CHANGE MAC SECURITY SETTINGS TO ALLOW DOWNLOADS FOR MAC OS X
Vlc Media Player Free Download For Mac Os X on this page. Selecting the option to 'Block all incoming connections' prevents all sharing services, such as File Sharing and Screen Sharing from receiving incoming connections.

Automatically allow signed software to receive incoming. Using the Mac Security Preference Pane - General Mac Security Settings.
