Today I decided that I needed to change the Item-Level Permissions settings for a document library so that users could only read the items that they had created.  For SharePoint lists, the Item-Level Permissions setting is easily configured under the list’s Advanced Settings section, like this:     However, when I went to the Advanced Settings section for my document library, there was no section for Item-Level Permissions.  I checked a few other lists and document libraries and confirmed that apparently most list types support this configuration, except for document libraries!   So my next question was whether Item-Level Permissions settings could not be changed in a document library at all, or whether these options were simply not displayed in the browser for the Advanced Settings in a library.  I figured the easiest way to determine this would be to attempt it with PowerShell in a test environment… if it was not supported, the PowerShell commands would simply fail to execute ...