Recently senators voted 64 to 36 to approve an agreement containing Section 203. This section restricts access to the Death Master File (also called the SSDI) to certified individuals under a new program established under the Department of Commerce. The access restrictions are for 3 years from the date of death.
For more details see the Washington Post article Senate passes bipartisan budget agreement
You can also read section 203 pages 32-37 to read the restrictions at
Barbara Mathews has written an excellent blog post on the S.S.D.I. called What is it about genealogists and the SSDI?
As well you can listen to the 2012 testimony regarding the Social Security Death Master File courtesy of Michael John Neil