3.3 Sharing and Protecting Files

Computer sharing happens all the time. Personal computers may be cheap enough to be treated as personal property, but computers running server software share their resources continuously with countless users. Some desktops require controlled sharing, like those in libraries or computer labs in schools. Physicians, attorneys, financial planners, and many consultants may use a home computer to process sensitive information about patients or clients; these professionals are obligated to keep this information away from family members.

Sharing always has its limits. In a shared kitchen, the household’s human residents may be perfectly happy to share boxes of cereal and bins of sugar with one another, but not with ...

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