I am trying to introduce a permission mechanism for our intranet web pages. The goal is providing access to some documents to different people. To accomplish that, I made some changes to the permissions. It used to be set as "Use same permissions as root web". Now I changed to "Use unique permissions for this web". The problem is that if I change a permission for a page in one of the directory, the change is affecting all web pages. In other words, I cannot set different permissions for different web pages/subdirectories. Is there any explanations/suggestions to this problem?