PDF Creator Pilot supports the following permissions for changing a document:

If the document's EncryptionLevel is equal to el40bitRC4:

Name	Changes Allowed	Value
DisallowChanges	None	0
AllowLevel1Changes	Commenting, filling in form fields, and signing existing signature fields	1
AllowLevel2Changes	Page layout, filling in form fields, and signing existing signature fields	2
AllowLevel3Changes	Any, except extracting pages	3
AllowLevel4Changes	Any, except extracting pages	4

If the document's EncryptionLevel is equal to el128bitRC4:

Name	Changes Allowed	Value
DisallowChanges	None	0
AllowLevel1Changes	Inserting, deleting, and rotating pages	1
AllowLevel2Changes	Filling in form fields and signing existing signature fields	2
AllowLevel3Changes	Commenting, filling in form fields, and signing existing signature fields	3
AllowLevel4Changes	Any, except extracting pages	4