File:БСЭ1. Вязкость 8.jpg

This work is in the public domain in Russia according to article 1281 of the Civil Code of the Russian Federation, articles 5 and 6 of Law No. 231-FZ of the Russian Federation of December 18, 2006 (the Implementation Act for Book IV of the Civil Code of the Russian Federation). This usually means that one of the following conditions is fulfilled. The 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. This work was originally published anonymously or under a pseudonym: (a) before January 1, 1943 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, or (b) between January 1, 1943 and January 1, 1954, and the name of the author did not become known during 70 years after publication, counted from January 1 of the year following the year of publication. This work is a film (a video fragment or a single shot from it): (a) which was first shown before January 1, 1943[2] or (b) which was created by legal entity between January 1, 1929 and January 1, 1954, provided that it was first shown in the stated period or was not shown until August 3, 1993. 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[3] and January 1, 1954, provided that it was first released in the stated period or was not released until August 3, 1993. [1] If the author of this work was subjected to repression and rehabilitated posthumously, copyright term is counted from January 1 of the year following the year of rehabilitation. If the work was first published after the death (posthumous rehabilitation) of the author, copyright term is counted from January 1 of the year following the year of publication, provided that the work was published within 50 years after the death of the author who died (and was not posthumously rehabilitated) before January 1, 1943, or within 70 years after the death (posthumous rehabilitation) of the author who died (rehabilitated posthumously) between January 1, 1943 years before January 1, 1954. [2] Amateur films which were first shown on January 1, 1943 or later are subjects of points 1-2 of this template. [3] ROSTA reports created before July 10, 1925 are subjects of points 1-2 of this template. العربية ∙ Deutsch ∙ English ∙ español ∙ suomi ∙ français ∙ italiano ∙ 日本語 ∙ македонски ∙ Plattdüütsch ∙ русский ∙ українська ∙ 中文（简体）‎ ∙ 中文（繁體）‎ ∙ +/−

This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag.

This work is in the public domain in the United States because it meets three requirements: it was first published outside the United States (and not published in the U.S. within 30 days), it was first published before 1 March 1989 without copyright notice or before 1964 without copyright renewal or before the source country established copyright relations with the United States, it was in the public domain in its home country on the URAA date (January 1, 1996 for most countries). For background information, see the explanations on Non-U.S. copyrights. Note: This tag should not be used for sound recordings.

This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag.

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

1. The 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:
   • (a) before January 1, 1943 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, or
   • (b) between January 1, 1943 and January 1, 1954, and the name of the author did not become known during 70 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):
   • (a) which was first shown before January 1, 1943^[2] or
   • (b) which was created by legal entity between January 1, 1929 and January 1, 1954, provided that it was first shown in the stated period or was not shown until August 3, 1993.
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^[3] and January 1, 1954, provided that it was first released in the stated period or was not released until August 3, 1993.