You cannot set permissions on page types. The way to go with this, is to create page type "aliases", which means you create several page types based on the same .aspx file. For example, instead of just having a page type named "News", you would create a page type called "Corporate News" and another called "Product News". They all are implemented using the same .aspx file. But when instantiating these pages in edit mode, you set access rights on them, f.ex. Product editors only have access to create pages under "Product News", while corporate editors only have access to create pages under "Corporate News". In addition, you would also want to set up restrictions on these two new page types on which page types should be allowed under these, f.ex. a page type called "News Item". Hope this helps. Frank :)