公家領域
公家領域（英文：Public domain，PD），又叫公有領域、公用領域，係指作品嘅版權已經去咗公家度，任何人都可以自由同免費去用。作者可以主動將版權放出去公家領域，其他人亦可以等作者死咗若干年之後（視乎唔同地方版權法），版權就會自動放出去公家領域。
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