Why does good disk utility image generate error message?

I created a disk image of a data cd using disk utility. When I open the dmg file I get the message:
"The disk image you are opening may be damaged and could damage you system. Are you sure you want to open this image?"
When I open the image there are no issues and the content is correct. Why is this message being generated and what can I do to keep it from happening?

Hi Burkely,
"The disk image you are opening may be damaged and could damage you system. Are you sure you want to open this image?"
This is a standard message ...
Dimaxum

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Why does good disk utility image generate error message?

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