本研究旨在探討資訊服務業者如何混合運用正式化與非正式化創新保護機制，以確保資訊系統開發過程中的智慧財產權保護。本研究主張混合式創新保護機制的採用須根據受保護之知識種類與型態進而調整其混和方式，當受保護之知識種類與型態隨著資訊系統開發階段改變，亦需動態調整混和式創新保護機制以達到創新保護之綜效。本研究採用單一個案跨時研究方法進行寅證，觀察一間資訊服務業c公司在2001〜2003年間配合線上資訊系統開發階段，動態導入不同型態的混合式創新保護機制，以維護其智慧財產權益。本研究發現，在系統規劃階段，關鍵創新保護標的為客戶蒒商業資訊之顧客知識，個案公司採用營業祕密及著作財產權等正式化創新保護機制為主，搭配存取控制之非正式化創新保護機制為輔；在系統開發設計階段，關鍵創新保護標的為資訊系統開發程式碼之產品知識，個案公司以存取控制與版本控制等非正式化創新保護機制為主，搭配著作財產權與著作人格權之正式化創新保護機制為輔；在系統測試導入與維護階段，關鍵創新保護標的為鑲嵌於資訊系統内的管理知識，個案公司採用存取控制、版本控制及時效性控制等非正式化創新保護機制為主，搭配營業祕密與著作財產權、著作人格權之正式化創新保護機制為輔。

The study explores how the IT-service firm, C company adopts the joint use of appropriability strategies (combining with formal and informal appropriability forms) in response to its innovation protections. We propose that adopting different patterns of joint use of appropriability strategies in effective innovation protection dep-ends on protection targets of knowledge types at different phases of IT system development. Empirically, we use the case study research and focus on the IT-service firm observation during 2001-2003. Specifically, we reveal that dynamic patterns of joint use of appropriability are adopted regarding whether different knowledge types differ in its phases of IT system development. To focus on customer knowledge at the phases of system planning, C company protects its innovations by using trade secrets and copyrights as formal appropriability and accompanies informal appropriability of access control. To focus on product knowledge at the phases of system development, C company not only adopts informal appropriability of access control and centralized version control, but uses formal appropriability of copyrights in protection its innovations. Finally, to focus on management knowledge at the phases of installation and maintenance, C company takes formal and informal appropriability forms simultaneously that include access control, centralized version control, time constrain, trade secrets and copyrights.