When you say rights, are you referring to privileges (User Rights) or do you
mean permissions?
When you say network, are you talking about the Active Directory itself or
all servers on the network?
If you mean permissions, and are talking about the servers or AD, there's
nothing native that will simply do this. You can cook up some scripts and
then amalgamate the data, or you need to look at 3rd part solutions.
There's several. I believe one of Script Logic's products do this.
TreeSize Pro might as well -I can't remember as it's been years.