The Enforcement Rules of the Prison Act Article 54

“Before release from Prison” provided in Paragraph 4, Article 120 of the Act refers to the situation in which the prisoner has not left the Prison, including when a prisoner is having subsequent execution of detention inside the Prison or performing labor services commuted from a fine and therefore has not left the Prison; “a material breach of rule” provided in the provision refers to when a prisoner has any act that jeopardizes the order or security of the Prison under Paragraph 1, Article 86 of the Act and is subjected to transfer to a housing area for rule breakers in accordance with Subparagraph 4, Paragraph 1 of the same Article.
中文原文 監獄行刑法施行細則第54條
本法第一百二十條第四項所稱未出監前,指受刑人尚未離開監獄而言,包含在監內接續執行拘役或罰金易服勞役等刑罰,尚未出監者;所稱發生重大違背紀律情事,指受刑人發生依本法第八十六條第一項所定妨害監獄秩序或安全之行為,經依同條第一項第四款規定,受移入違規舍之懲罰。

English translation for reference only; the Chinese text prevails. Not legal advice.