/fɜrst seɪl ˈdɒktrɪn/ – Phrase
Definition: Quy định bán lẻ đầu tiên.
A more thorough explanation: a principle which allows the original purchaser of a copyrighted work the right to sell or give away the copy they have obtained in any way they choose
Example: The first sale doctrine creates a basic exception to the copyright holder’s distribution right.