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Controlling Access to Your Data (part 2) - Special Permissions

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3/26/2011 3:03:39 PM

2. Special Permissions

Each basic permission is actually a set of special permissions. Because of this, whenever you allow or deny a basic permission, Windows 7 works behind the scenes to manage the related special permissions for you. Table 2 lists the special permissions related to each basic permission.

Table 2. Basic permissions and the related special permissions
Basic permissionRelated special permissions
ReadList Folder/Read Data
 Read Attributes
 Read Extended Attributes
 Read Permissions Synchronize
Read & Execute or List Folder ContentsAll special permissions for Read listed previously
 Traverse Folder/Execute File
WriteCreate Files/Write Data
 Create Folders/Append Data
 Write Attributes
 Write Extended Attributes

Read Permissions

Synchronize
ModifyAll special permissions for Read listed previously
 All special permissions for Write listed previously
 Delete
Full ControlAll special permissions listed previously
 Delete Subfolders and Files
 Change Permissions
 Take Ownership

2.1. Viewing and modifying existing special permissions

You can view and set special permissions for a file or a folder by completing the following steps:

  1. In Windows Explorer, right-click the file or folder you want to work with and then select Properties.

  2. In the Properties dialog box, select the Security tab and then click Advanced. In the “Advanced Security Settings for” dialog box, the permissions are presented much as they are on the Security tab. The key difference is that you now have additional advanced options.

  3. On the Permissions tab, click Change Permissions. This opens an editable view of the Permissions tab in a new dialog box, as shown in Figure 3.

  4. Click the existing user or group whose permissions you want to modify, and then click Edit. This displays an editable “Permission Entry for” dialog box (see Figure 4). If any permissions are shaded (unavailable), they are being inherited from a parent folder. You can override the inherited permission, if necessary, by selecting the opposite permission, such as Deny rather than Allow.

  5. To modify existing permissions, use the Allow and Deny columns in the Permissions For list. Select checkboxes in the Allow column to add permissions, and clear checkboxes to remove permissions.

  6. To prevent a user or a group from using a permission, select the appropriate checkbox in the Deny column. Denied permissions have precedence over other permissions.

  7. Click OK to save your changes.

Figure 3. Working with advanced permissions


Figure 4. Setting individual advanced permissions


2.2. Adding new special permissions

You can add new special permissions to a file or folder by completing the following steps:

  1. In Windows Explorer, right-click the file or folder you want to work with and then select Properties.

  2. In the Properties dialog box, select the Security tab and then click Advanced. This opens the “Advanced Security Settings for” dialog box.

  3. On the Permissions tab, click Change Permissions. This opens an editable view of the Permissions tab in a new dialog box.

  4. If a user or group whose permissions you want to assign isn’t already listed, click Add to display the Select User or Group dialog box.

  5. Type the name of a user or a group account. Click Check Names and then do one of the following:

    • If a single match is found for each entry, the dialog box is automatically updated as appropriate and the entry is underlined.

    • If multiple matches are found, you’ll see an additional dialog box that allows you to select the name you want to use, and then click OK.

    • If no matches are found, you’ve probably entered an incorrect name. Modify the name in the Name Not Found dialog box and then click Check Names again.

  6. In the “Permissions Entry for” dialog box, configure permissions for the user or group you added by allowing or denying access permissions as appropriate.

  7. Click OK to save your settings.

2.3. Removing new special permissions

You can add new special permissions to a file or folder by following these steps:

  1. In Windows Explorer, right-click the file or folder you want to work with and then select Properties.

  2. In the Properties dialog box, select the Security tab and then click Advanced. This opens the “Advanced Security Settings for” dialog box.

  3. On the Permissions tab, click Change Permissions. This opens an editable view of the Permissions tab in a new dialog box.

  4. Click the existing user or group whose permissions you want to remove, and then click Remove.

  5. Click OK to save your changes.

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