Это анонимная или псевдонимная работа, и со дня её публикации прошло 50 лет.
Это другое произведение, и с года смерти автора (или последнего из оставшихся в живых авторов) прошло 50 лет.
Это один из «официальных документов» (законы, постановления, решения и т.п.), а также их официальные переводы; официальные символы и знаки (флаги, гербы, медали, денежные знаки и др.); произведения народного творчества; регулярная информация прессы, которая представляет собой ежедневные новости или информацию о текущих событиях».
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