As the name implies, those products that come with "unrestricted rights" don't come with a license full of "dos and don'ts." For example, getting unrestricted basic resell rights usually means you are free to sell the product as you please, including on auction sites, as a bonus to a paid product and so on. Getting unrestricted private label rights to a product usually means that you can do anything you want with the product - modify it in any way, change it to a different format, etc.

Note: Even though "unrestricted" is a pretty clear term, some product creators still slip small restrictions into their licenses. As such, be sure to read the license to make sure the product really is unrestricted.