The copyright situation of this work is theoretically uncertain, because in the country of origin copyright lasts 95 years after the death of the author, and the date of the author's death is unknown. However, the date of creation of the work was over 145 years ago, and it is thus a reasonable assumption that the copyright has expired (see here for the community discussion). Do not use this template if the date of death of the author is known. 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.  Note that Mexico has a term of 100 years and does not implement the rule of the shorter term, so this image may not be in the public domain in Mexico.

Bylo zjištěno, že u tohoto souboru nejsou známa žádná omezení daná autorským právem a právy s ním souvisejícími.

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.

Note: This tag applies to scans and photocopies only. For photographs of public domain originals taken from afar, {{PD-Art}} may be applicable. See Commons:When to use the PD-Art tag.