Lockheed_Model_749A_Constellation_silhouette.jpg

Summary

Description	English: Lockheed 749A Constellation silhouette. The 1952 edition of the Observer's Book of Aircraft used 34 Crown Copyright silhouettes provided by the Controller of H.M. Stationery. An acknowledgements section on page 5 of the book identifies them by page. This image is one of those and since the publication date is pre-1957 is in the public domain.
Source	The Observer's Book of Aircraft 1952, William Green and Gerald Pollinger, Fredericke Warne & Co London 1952C
Author	Crown Copyright

This work created by the United Kingdom Government is in the public domain .

This is because it is one of the following :

It is a photograph taken prior to 1 June 1957; or
It was published prior to 1974; or
It is an artistic work other than a photograph or engraving (e.g. a painting) which was created prior to 1974.

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

See also Copyright and Crown copyright artistic works .