Okay; not the error I listed. The generic "access denied" has no single solution and can be from a variety of causes.
encore is processing the file, it doesn't get to the burn DVD stage.
So we need to narrow down where the issue is.
Where your assets already transcoded, or was this being done during the build? Look in the project panel, under the DVD transcode status column. What does it say for the timeline assets (video/audio files). If you assets are not transcoded, use "transcode now" to remove that step from the build.
Whether it got to the burn stage or not, it is possible that you could build to a folder or image. So test that by building to an image.
Try a chicken and you'll find out why a duck!