Trade Secrets Act Article 5

Where a trade secret is the result of joint research or development by two or more parties, the respective shares in the ownership of the trade secret shall be determined by contract. In the absence of a contract, an equal share of the ownership shall be presumed.
中文原文 營業秘密法第5條
數人共同研究或開發之營業秘密,其應有部分依契約之約定;無約定者,推定為均等。

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