一般來說，DVD Region可變動次數主要是在兩個地方做限制：軟體和硬體。
軟體主要指的是像 winDVD這一類的player。要達到Region Free(RPC-1)，硬體方面就是換Firmware，或是改變機體後方的jumper設定，或是執行某些程式做變更，像是 LTH-165H-rpcde2 這一類的程式。而軟體方面像winDVD的話可以用 DVD genie來變更，這些都不是問題。
不過，就連OS也有設定DVD Region的地方，像是win2000的控制台-光碟機就有設定Region的選項，還很機車的只有一次更改的機會，怎麼辦呢? Google大神告訴我們下列解決的方法：
It appears that the multi-hash techniques initially designed for Windows 2000 may not have been implemented due to some other issues. If you have a region free drive, then the following is true :
When you install clean Win2k Pro you have region 1 set and 1 change left…After one change – that’s it… locked.
However, load REGEDT32 and go to [HKEY_LOCAL_MACHINE\Software\Microsoft]. You should see a strange looking random letter key (for example “`dv:=/”) as the first entry… Delete the entire key. Reboot the machine and… the first disc you’ll use will be set as the new region, with 1 change left…. Works every time… try it and see.
Versions 3.75 and later of DVD Genie should be able to find this key for you and allow you to backup and erase the key with ease.
This method has been confirmed to be working with Windows 2000 Service Pack 2 and Windows-XP!.
我試過的確可行!!
