Here is some code that can be very useful to hide certain parts of a page from users.

<SharePoint:SPSecurityTrimmedControl PermissionsString="AddAndCustomizePages, ManageLists" runat="server"> <%--content %> </SharePoint:SPSecurityTrimmedControl>

The important piece here is the PermissionString value. Any of these values that are not bolded are acceptable as a permissionstring. Notice that they correlate to the more detailed permissions that we see when setting up a new permission level, and also that there are no spaces between the words.

List Permissions
ManageLists
CancelCheckout
AddListItems
EditListItems
DeleteListItems
ViewListItems
ApproveItems
OpenItems
ViewVersions
DeleteVersions
CreateAlerts
ViewFormPages
Site Permissions
ManagePermissions
ViewUsageData
ManageSubwebs
ManageWeb
AddAndCustomizePages
ApplyThemeAndBorder
ApplyStyleSheets
CreateGroups
BrowseDirectories
CreateSSCSite
ViewPages
EnumeratePermissions
BrowseUserInfo
ManageAlerts
UseRemoteAPIs
UseClientIntegration
Open
EditMyUserInfo
Personal Permissions
ManagePersonalViews
AddDelPrivateWebParts
UpdatePersonalWebParts