The DVD might be a bit of a problem, I'm not sure that you can impact the Security Discripter GUID / ACL of the files written there so copying to or moving from may be an issue.
The USB thumb drive or disk should be a simple matter of Taking Ownership of the Containers / Sub-Folders and Files and then if needed granting your user account explicit full control of the same within the container properties, under the Security Tab, simply by adding your name and the appropriate rights to the files.
You can use this utility
http://www.howtogeek.com/howto/wind...ership-to-explorer-right-click-menu-in-vista/ to simplify the take ownership process by adding it to the right click menu.
When you manage to get the USB squared away, then try the same process on the DVD, if it's re-writeable then I would assume you can do the same, although I can't say that I've ever tried, I don't think the default format for a data disk even supports NTFS security, so maybe simply taking ownership might do it.
Keep in mind that you need to have permissions on both ends of the process, source and destination.