Well, today I came across a very useful website called VIDEOHelp , where they have more than 5000 DVD players sorted by the make / model number. Just search for the model number of your player and follow the steps they have given. At the end you will be able to make your DVD player Region Free - What this really means that you can play DVD's from any region of the world.
As an example I have pasted below the steps to be followed to make the Philips DVP642 DVD Player Region Free.
1. Turn on the player.
2. Open the tray.
3. Press the following sequence on the remote:
7 8 9 OK 0
4. The number 0 will appear on the lower left side of your screen.
5. Your player is now region free! Put in a DVD and enjoy! :)
NOTE: The 0 in the sequence above represents the region code. 0 = region free. If you want to change your player to just a specific region code, replace the 0 with the region number you want.
The tip should be perfectly safe, but USE IT ON YOUR OWN RISK!