Which user(s) require NTFS security to the PDF check copies base folder?

The PDF Check Copy feature does not operate under a single system user, but at the Active Directory level the resource is being used  on a per user basis.The folder structure at the PDF Base Folder location will break out directories by company. If you want to restrict some users from reading/writing to certain company folders in the given base folder location you would allow or restrict permissions based by user.