Thanks for comments, I do not propose to do anything illegal but would like to keep an off-site backup and licence key with my other data 'just in case'. I would use Nero to do the copy but wonder if M'soft have put some ' uncopy-able' files on there. I would need to keep the dvd on-site for things like sfc
Just looked up the License Terms for Software Licensed from Microsoft and it says that you are allowed to make one backup copy of the media. So that solves that query. Can anyone confirm that I can do the backup with Nero please?