There was then a long legal case over the freehold title (actual ownership) of the park lands. The case continued until November 1983, when Prime Minister Bob Hawke acknowledged that the traditional owners had the rights to Uluṟu. In 1985, the Territory passed two amendments: one for the Aboriginal Land Rights Act and one for the National Parks and Wildlife Conservation Act. The freehold title to the land in the park was passed to the Uluṟu–Kata Tjuṯa Aboriginal Land Trust on 26 October 1985. As part of the agreement, the land was immediately leased back to the Director of National Parks for a period of 99 years. The title is inalienable, which means that it can not be sold, traded or given away; it is inherited continuously by the community's descendants.