How does SPListItem HasUniqueRoleAssignments property is calculated?

Question

Does the value for the property HasUniqueRoleAssignments of SPListItem can be found in the SharePoint DB or is it a calculated property? And if it is calculated - then how?

Answer 1

It can be found by calling the proc_SecGetSecurityInfo stored procedure and getting the IsScope parameter from the result set.

IsScope:

A flag indicating that the document is the securable object at the root of the scope. [MS-WSSFO3]: Windows SharePoint Services (WSS): File Operations Database Communications Version 3 Protocol