According to Wikileaks the recently leaked Danish website blocking list is compiled by the Danish police and the Save The Children group and is supposed to contain child pornography.
It has already been determined by a poster at Somebody Think of the Children that the list also includes a website for a Dutch trucking company - vanbokhorst.nl.
However, it can now be confirmed that the list also contains several LEGAL pornographic sites.
USC 2257 is the US legal compliance notice that all US porn sites are required to display.
Using Google to search for "USC 2257" reveals that the very first site on the list contains the US statement providing age confirmation and contact details for the authorities to verify the records. And indeed the site appears to be legal and
The suggestion is that the Danish Authorities may be extending their banning remit to include such material as Hustlers Barely Legal.