When the question of the copyright status of MIL-HDBK-141 came up, I did some research and found this web site: http://www.dtic.mil/cendi/publications/00-3copyright.html#214 Section 2 has the answers to a couple of questions that have arisen. Specifically, quoting the web site: 2.1.1 What is copyright? Copyright is a form of protection provided by the laws of the United States (Title 17 of the United States Code (17 USC - Copyrights20) to the authors of original works of authorship including literary, dramatic, musical, artistic, and certain other intellectual works. (See also Title 37 Code of Federal Regulations (37 CFR, Chapter II)21, which implements this statute.) Copyright protection arises automatically once an original work of authorship is fixed in a tangible medium of expression, now known or later developed; e.g., written, filmed, recorded. It does not require that a copyright notice be placed on the work, that the work be published, or that the work be deposited or registered with the Copyright Office or any other body. and 2.1.4 Can facts, databases and compilations be copyrighted? Facts cannot be copyrighted. However, the creative selection, coordination and arrangement of information and materials forming a database or compilation may be protected by copyright. Note, however, that the copyright protection only extends to the creative aspect, not to the facts contained in the database or compilation. Because I'm not sure when the database(s) was/were created: 2.1.6 How long does copyright last? Under current Copyright Law, the copyright term for works created by individuals on or after January 1, 1978, is the life of the author plus 70 years. For "works made for hire," the copyright term is 95 years from the date of first publication or 120 years from the date of its creation, whichever is earliest. The copyright term for works created before January 1, 1978, is a complicated determination and may require help from your General Counsel or the Copyright Office. The current Copyright Law established dates at which Copyright protection for unpublished works expires and those works pass into the public domain. Unpublished works created prior to January 1, 1978, and not published, will pass into the public domain 70 years after the author's death or at the end of 2002, whichever is later. Unpublished works created prior to January 1, 1978, but which are published between then and the end of 2002, will pass into the public domain 70 years after the author's death or at the end of 2047, whichever is later. Additionally, all works published before 1923 are now in the public domain So, it is copyrighted unless we say otherwise. Joe