Because of the graphical interface and "openness" of the operating system, Macintosh computers are susceptible to undesirable changes by the user. This presentation discusses the advantages and disadvantages of software packages that offer protection for the Macintosh system. The two basic forms of software security packages include a package that provides protection by masking the interface a user would see on an unprotected system, and a package the protects the system while maintaining the standard operating system. A description of three specific packages is provided, including control features, comments and costs. (AEF)