Plagiarism: using someone else's work or ideas without permission and presenting them as one's own.
彼の論文はほかの研究の文章をそのまま使っており、盗作だと指摘された。
His paper used passages from other research verbatim and was accused of plagiarism.
作曲家のメロディー盗作の疑いがニュースになった。
Allegations of melodic plagiarism by the composer made the news.
盗作が発覚すると学会や出版社から厳しい処分を受けることが多い。
When plagiarism is discovered, it often leads to severe sanctions from academic societies or publishers.