There could be several reasons why you are unable to copy files from a DVD to your computer:
DVD write protection: Some DVDs come with copy protection that prevents users from copying their content.
DVD format compatibility: If your computer's DVD drive is not compatible with the format of the DVD, it may not be able to recognize or read the contents of the disc.
Scratched or damaged DVDs: If the DVD is scratched, dirty, or damaged, it may cause read errors and prevent the files from being copied successfully.
Software or hardware issues: Problems with your computer's DVD drive, incompatible software, or driver-related issues can also hinder the copying process.
In any case, troubleshooting steps could involve attempting to copy the files using different software, cleaning the DVD, trying a different DVD drive or computer, or in some cases, using specialized software that can bypass copy protection mechanisms