Security/Permissions

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http://office.microsoft.com/en-us/windows-sharepoint-services-help/permission-levels-and-permissions-HA010100149.aspx In this article Although sites that are built on Windows SharePoint Services often have additional default SharePoint groups, Windows SharePoint Services 3.0 includes five permission levels (permission level: A set of permissions that can be granted to users or SharePoint groups on an entity such as a site, library, list, folder, item, or document.) by default.

Permission levels and permissions - Windows SharePoint Services - Microsoft Office

One of the largest causes for complaints in previous versions of SharePoint was the lack of Securable Objects (SO) that existed only allowing end-users the option of securing items at the library level.

Item Level Security Model (ILS), Securable Objects (SO), and Content Structure (SharePoint Site Definitions, Lists, Features, and Solutions)

http://www.sharepointsecurity.com/sharepoint/sharepoint-security/item-level-security-model-ils-securable-objects-so-and-content-structure-sharepoint-site-definitions-lists-features-and-solutions/
http://blogs.msdn.com/b/sridhara/archive/2008/06/27/what-permissions-is-behind-the-permission-levels-roles-in-sharepoint.aspx Recently, I was involved in a support request where I had to find out what SPBasePermissions are assigned behind permission level in SharePoint using SharePoint OM code.

What permissions are behind the permission levels (roles) in SharePoint - Sridhar's blog