There's a bug in the Bluetooth®-stack of OS X® 10.8/10.9 in the context of pairing a Sony® PS3 BD Remote. OS X® 10.8/10.9 will ask you to enter a PIN code when you try to connect your remote control. This problem is known by Apple®.

If you pair your Sony® PS3 BD Remote with your Mac® for the first time

1. Use Remote Buddy's Setup Wizard to pair your remote control
2. Restart your Mac® directly after the pairing was successful, while the remote is still connected.
3. The remote should now work without problems.

If you've already paired the Sony® PS3 BD Remote with your Mac®

1. 10.9 only: Try entering 0000 as PIN and reboot. If you're lucky, that was all you needed to do. If this does not solve your issue, please continue with the steps that follow.
2. First, we'll need to remove the Link Key of your Mac® from the memory of your remote control. Since this remote control can only store one Link Key, it's as easy as pairing the remote control with another Mac®. To do so, open System Preferences > Bluetooth on another Mac® and pair your remote with it.
3. All steps that follow should be performed on the Mac® that you want to use your remote control with.
4. Remove - if it exists - the entry of your remote control at Remote Buddy > Preferences > Hardware ® Bluetooth Receiver. The entry usually is titled "BD Remote".
5. If existant, remove the device "BD Remote" from System Preferences > Bluetooth.
6. Delete the Bluetooth preferences files by entering the following in Terminal.app and hitting return (Warning: this deletes all information about all paired Bluetooth® devices):

   sudo rm /Library/Preferences/com.apple.Bluetooth.plist
   sudo rm ~/Library/Preferences/com.apple.Bluetooth.plist
   sudo rm ~/Library/Preferences/ByHost/com.apple.Bluetooth.*.plist
   

   Please enter your admin password when requested. Then restart your Mac®.
7. Use Remote Buddy's Setup Wizard to pair your remote control
8. Restart your Mac® directly after the pairing was successful, while the remote is still connected.
9. The remote should now work without problems.

These settings are recommended:

General

Search for paired remotes on startup: On.
Stop searching for paired remotes after max .. minutes: Off.
Display pairing instructions and status messages: Off. If you experience problems, you should turn this option back on to aid you in debugging the problem.

Energy saving

Automatically disconnect remotes after inactivity of more than .. minute(s): On, value of 1 minute.
Disconnect remotes when computer goes to sleep: On. The potential power saving with this option is huge. But as the warning says, this will not work with all computers: if you can't wake up your computer with your remote after turning this option on, please turn it off again.