This is because it is one of the following:

1. It is a photograph taken prior to 1 June 1957; or
2. It was published prior to 1975; or
3. It is an artistic work other than a photograph or engraving (e.g. a painting) which was created prior to 1975.

HMSO has declared that the expiry of Crown Copyrights applies worldwide (ref: HMSO Email Reply)
More information.

1. It is a statute, regulation, Knesset protocol or judicial decisions of the courts or of any other government entities having judicial authority according to law and therefore ineligible for copyright protection according to §6 of the 2007 statute; OR
2. It was created more than 50 years ago (i.e. before 1 January 1975), and the State's copyright has therefore expired according to §§42–43 of the 2007 statute PROVIDING THAT

• The State of Israel was the first owner of copyrights on this work; AND
• The State did not waive its copyrights in a special contract with the author when this work was created.

 See also category: PD Israel & British Mandate.