How to change the region code. I purchased DVDs from Great Britian on EBAY and they will not play on my DVD player. A message appears "Invalidregioncode".

You need region free dvd player. Some models can be simply modified by changing settings in secret menu

DVDs come imprinted with a region code for the geographical area they are sold in. DVD players sold in the same area(s) have the same region code. If you purchase DVDs made for a different region code, they will not play on your player. This is done to prevent piracy and copyright violators. Players can have their region codes changed, but then anything you have already will not play, and you are usually limited to three or four region changes before the player will not allow any more.

Here is a link to a Wikipedia article explaining Region Codes in more detail....
DVD region code

You can't change the DVD coding. That part is how the DVD is recorded. However, your Mac will play DVDs from another region. It just typically defaults to one region. I have deleted the DVD player software (and preferences files) before and reloaded it to play DVDs from another region. If you plan to regularly play DVDs from multiple regions, you might want to look for special DVD software that will read DVDs from multiple regions.

Unfortunately, you have a DVD player that is "Region Specific" and cannot be changed. Your system has a region code printed on the back of the unit and will only play DVDs that are labeled with identical region codes. DVDs labeled "ALL" will also play in this unit. If you try to play any other DVD, the message " Playing this disc is prohibited by area limits." will appear on the TV screen. Depending on the DVD, no region code indication may be labeled even though playing is prohibited by area limits.

The problem with Amazon DVDs purchased is the region codes each disc may contain. Since a majority of them would be from USA, and their region is 1, your player being region 4 would not support that code.

There is no fault here, it is just a restriction. Some discs work, some don't.

No one likes region restrictions - particularly on DVDs bought legally, and I doubt very much Panasonic would provide any information on unlock codes for you.

Be warned: if you do successfully find a hack to unlock your player so it becomes region-less, expect the risk of either the player failing later, or not reading any discs at all. I am sure there are 'region-free' players around now, which don't contain a restriction and can play ANY DVD any region.

On the other hand, if you have a DVD drive on your PC, and it is set to region 0 or all regions, and the discs play fine in it, but not the player, then you could view those particular discs that way; you do not need to make any copies of any of the DVDs just to watch them.

DVD region is an anti-piracy method to block DVDs from other countrys to be played on a region where that DVD isn't available for selling. You still can watch that DVD by changing the DVD Player region code from options but be aware that you have a limited number of changes, after changes reach 0 you cannot change DVD region code anymore and your DVD player will be stucked to a certain region that you selected.

That is because the Disc is coded for Region 3 and your player is coded for Region 1. See

http://dvdbuyingguide.com/codefreedvd/bigfaq.html

The following hack may make your player region free:

http://www.videohelp.com/forum/archive/region-hack-for-new-insignia-ns-pdvd10-t337342.html

Turn on the unit with the remote controller, Wait until "no disc" appears in the unit's display. Press the keys: PAUSE, 3, 1, 4, 1, 5, 9. And "CODE" will appear in the display. Press the number key that corresponds to the disc zone you want to play within the next 5 seconds:0: All regions / 1: Region#1 / 2: R#2/... and so on. Then, within 5 seconds, press: PAUSE, POWER... and voilà. If you don't have good results, disconnect the equipment and repeat.
Or
Put your player in standby mode and then enter: [[0] [ENTER] Default Default region code [1] [ENTER] or [UP] [ENTER] Region 1 [2] [ENTER] or [RIGHT] [ENTER] Region 2 [3] [ENTER] or [DOWN] [ENTER] Region 3 [4] [ENTER] or [LEFT] [ENTER] Region 4 [5] [ENTER] or [TITLE] [ENTER] Region 5 [6] [ENTER] or [DVDMENU] [ENTER] Region 6 [7] [ENTER] or [RETURN] [ENTER] Region 7 [8] [ENTER] or [DISPLAY] [ENTER] Region 8
Or
Put player into standby modes by pressing power button on remote control. Then press Title button. Press Clear button. Press Power button.
I found these codes for all the other DVP-SR series players, yours was not listed but I thought was worth a try.

1) those DVDs are coded in Region 1(Canada, United States; U.S. territories; Bermuda)
you will have to change the region code on the dvd-rom to region 1

2) if you bought the stand alone DVD player in the U.S. it will play region 1 dvds and nothing else(some dvd players will play region code 1-6)

3) to change the code in windows vista you'll have to go under the drive property's in the device manager go to the dvd region tab and set it to what ever the number on the back of the dvd is WARNING you only get 4 changes before the drive locks you out permanently then your stuck with what ever number you put in on the 4th try you've been warned

windows xp/2000/98/me
you'll have to change the region code from your software player again your limited on how many times you can change the region code before you have to reinstall the dvd player software

With remote control and player stopped,
press setup, vol+, vol-, vol+, vol-
Use arrow keys to select region 1-6 or 255 for all region.
Numbers appear on TV screen.
Press setup again to save and exit

Try this to make it multiregion. It should work.