Possible enumeration values:

NameValueDescription
EmptyMask

0

ViewListItems

1

AddListItems

2

EditListItems

3

DeleteListItems

4

ApproveItems

5

OpenItems

6

ViewVersions

7

DeleteVersions

8

CancelCheckout

9

ManagePersonalViews

10

ManageLists

12

ViewFormPages

13

AnonymousSearchAccessList

14

Open

17

ViewPages

18

AddAndCustomizePages

19

ApplyThemeAndBorder

20

ApplyStyleSheets

21

ViewUsageData

22

CreateSSCSite

23

ManageSubwebs

24

CreateGroups

25

ManagePermissions

26

BrowseDirectories

27

BrowseUserInfo

28

AddDelPrivateWebParts

29

UpdatePersonalWebParts

30

ManageWeb

31

AnonymousSearchAccessWebLists

32

UseClientIntegration

37

UseRemoteAPIs

38

ManageAlerts

39

CreateAlerts

40

EditMyUserInfo

41

EnumeratePermissions

63

FullMask

65