advanced permissions

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I'm trying to set a single block on one page to be edited by a group. I've set the block to " edit content" and "approve content". Set that area to the same and set the page to " edit and approve content" . Problem is the group has edit and approve permissions to the header and footer.. Is there any way to remove those permissions?? Permissions option ( on the header and footer ) does not come up when when I left click..
any Ideas ??
Thanks

Bob

rdealmeida