People have a natural tendency to want to defend their things, their friends and family and even their ideas from others who may want to take or destroy. And, to an extent, such considerations must be allowed for in designing systems.
Two major ways that people have developed for defending are to limit the people who can access something and to have special spaces.
Ways of limiting the access that people have include the following:
Special Language
Badges and Uniforms
Skill Barrier
Passwords
Keys
Guards
Biometrics
Ways of limiting space include the following:
Borders
Secret Places
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