WinDVD Pro 11 will not play Region 0 (or Region Free) DVDs.
WinDVD is not designed to play back Region 0 DVDs. Corel® WinDVD will allow to change the region settings of the optical drive to match the region requirements of a disc. Corel® WinDVD will only support encrypted, regionalized discs. The available region settings are limited to the supported features for the current disc.
**The changes to the region settings for the optical drive has a limit of 5 times. Once the limit has been reached, it is no longer possible to make any further changes. The Changes until Permanent box displays the number of changes left.