Digital access service for priority documents. According to the Inquiry Transnational Procurement Network, DAS is the abbreviation of Digital Access Service, which is the digital access service for priority documents. It is established and managed by the International Bureau of the World Intellectual Property Organization and obtains priority documents through electronic exchange through cooperation between patent offices. Electronic services, DAS participating offices include China, the United States, Japan, South Korea, the United Kingdom, Finland, Australia, Denmark, Spain, Sweden, and the International Bureau.