Understanding of "Special permissions" in Windows file properties security

in the Windows file system, you can set permissions on files and folders, one of which is security, and you can manage files by setting the appropriate permissions for the user. In the access control entry there is a special option called "Special Permissions", through the search on the internet did not find that the option has been explained by the document, after the students reminded and their own experiments, finally came to the "special permission" meaning, explained as follows:

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First in the "Security" tab, divided into two parts, the above for Access Control List (ACL), under the Access Control option (ACE), you can see in the access control options have an option for "Special permissions", want to understand the meaning of this permission, first look at other permissions, here I only check the "read" option to allow , open the Advanced tab, click Edit, and you can see the granular partitioning of permissions in the Permission Entries dialog box,

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Already ticked a few options, this time I check a few more options, OK, then OK, go back to the Properties dialog box, this time can see the "read" option just checked, "Special permissions" This option is also checked by default,

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So we can come to the conclusion: "Special Permissions" is to give the user to customize the meaning of the choice of permissions, when the user wants to add more detailed permissions, you can select the permissions from the fine items themselves, so you can see "Special permissions" is checked.

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Understanding of "Special permissions" in Windows file properties security