Most countries attempt to restrict minors' access to hardcore materials, limiting availability to sex shops, mail-order, and television channels that parents can restrict, among other means. There is usually an age minimum for entrance to pornographic stores, or the materials are displayed partly covered or not displayed at all. More generally, disseminating pornography to a minor is often illegal. Many of these efforts have been rendered practically irrelevant by widely available Internet pornography. A failed US law would have made these same restrictions apply to the internet.