Súbor:Oskar Backlund.jpg

This usually means that one of the following conditions is fulfilled.

1. This work was originally published before January 1, 1929 and the known author of this work died:^[1]
   • (a) before January 1, 1950 or
   • (b) between January 1, 1950 and January 1, 1954, did not work during the Great Patriotic War and did not participate in it.
2. This work was originally published anonymously or under a pseudonym before January 1, 1929 and the name of the author did not become known during 50 years after publication, counted from January 1 of the year following the year of publication.
3. This work is a film (a video fragment or a single shot from it), which was first shown before January 1, 1929.
4. This work is an information report (including photo report), which was created by an employee of TASS, ROSTA, or KarelfinTAG as part of that person’s official duties between July 10, 1925^[2] and January 1, 1929, provided that it was first released in the stated period.

Toto dílo je ve Spojených státech amerických dílem volným (public domain), protože tam bylo registrováno u U.S. Copyright Office nebo zveřejněno před 1. lednem 1929.
^[1] If the author of this work was subjected to repression and rehabilitated posthumously, replace the death date by the later rehabilitation date.
^[2] ROSTA reports created before July 10, 1925 are subjects of points 1-2 of this template.

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