It is very unlikely that this work is public domain in the EU, or in any country where the copyright term is life-plus-70 years. However, it is in the public domain in Canada (where IMSLP is hosted) and other countries where the term is life-plus-50 years (such as China, Japan, Korea and many others worldwide). As this work was first published before 1926 or failed to meet notice or renewal requirements to secure statutory copyright with no "restoration" under the GATT amendments, it is very likely to be public domain in the USA as well.
|Composition Year||1915 or before|
|Genre Categories||; ; ;|
|Work Title||Sans Souci|
|Alternative. Title||Morceau characteristique pour piano|
|Composer||Huss, Henry Holden|
|Opus/Catalogue NumberOp./Cat. No.||Op.25 No.2|
|I-Catalogue NumberI-Cat. No.||IHH 12|
|Year/Date of CompositionY/D of Comp.||1915 or before|
|Copyright Information||Possibly public domain in EU and other 70 pma territories.|
|Dedication||Mme. Katherine Goodson|
|Composer Time PeriodComp. Period||Romantic|
According to Gary A. Greene's "Henry Holden Huss: An American Composer's Life", op. 25 existed in the composer's mind but not as a published set. The other units of what would have been op. 25 appeared in other published op. nos. So there is no op. 25, just op. 25/2.