Ownership and Permissions
From Mac Guides
Because Mac OS X has a Unix core, it utilizes ownership and permissions for its files, allowing multiple users. They limit the access of certain files to certain users.
Errors in ownership and permissions can occasionally cause errors. See Repairing Permissions for more information.
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Links
- Troubleshooting permissions issues in Mac OS X, Apple knowledge base
- Take Control of Permissions in OS X, Macworld article

