Protect VBA code for Excel

Question

除了在“项目属性”>“保护”下添加密码（我认为这实际上很容易破解）之外，如何防止用户查看/复制我的代码？

Answer 1

May be this is the good possibility: http://msdn.microsoft.com/en-us/library/office/aa189867(v=office.10).aspx

To provide the highest level of security for your VBA code, use Microsoft Visual Basic version 6.0 to create a Component Object Model (COM) add-in. Because the VBA code in a COM add-in is compiled as a dynamic-link library (DLL), it can't be modified without access to the source code used to originally create it. Application-specific add-ins are not compiled; you must use the same protections as templates and documents.