how to export file to DVD untouched in Lightroom?

[viodea]

I'm using the trail version of lightroom and see if this is my solution. I have some pictures taken from vacation and want to give them to my friends on a DVD. What I want to do is exporting the orginal file to DVD if they are untouched. Also, export those corrected version if it's been modified.

Is there a way to do it? The last time I tried it, Lightroom exported files are all "re-created". I did add keyword in my catalog. Is that the problem?

thanks