Sharepoint 2013 / Office 365 Document library item level permissions problem

Question

Hello,
I'm looking for a solution to enable users to upload documents to a document library, the ability to view other documents uploaded to the same document library, but able to edit or delete those other documents.
With a list you can use Item-Level security in Advanced Settings but this is not available for Document libraries. I could use workflows to assign individual permissions to document, but the the library already contains over 2,000 documents and will continue
to expand so I don't like the idea of having that many individual permissions set.
Are there any 3rd party plug-ins or solutions to this issue?
Thanks,

Answer 1

Try below:
http://www.hersheytech.com/Blog/SharePoint/tabid/197/entryid/28/Default.aspx
As it turns out the, setting Item-Level Permissions in a library is fully supported with PowerShell!
The PowerShell commands for changing this are very simple:
$web = Get-SPWeb http://YourSite/
$list = $web.Lists[“Your Document Library Name”]
$list.ReadSecurity = 2
$list.Update()
$web.Dispose()
Note the 3rd line which is where you determine the value for this setting using the following values:
1 = “Read all items”
2 = “Read items that were created by the user”
If you wish to modify the values for Create and Edit access instead, replace .ReadSecurity with .WriteSecurity with
the following values:
1 = “Create and edit All items”
2 = “Create items and edit items that were created by the user”
4 = “None”
For example:
$web = Get-SPWeb http://YourSite/
$list = $web.Lists[“Your Document Library Name”]
$list.WriteSecurity = 2
$list.Update()
$web.Dispose()
Also check 
http://sppermissions.codeplex.com/
If this helped you resolve your issue, please mark it Answered. You can reach me through http://freeit-support.com/