I am trying your product evaluation. I wish to ask: Is it possible when a task / project is complete and archived,any modification is frozen for all users except for administrators?

For example, a task is complete and later on, any user wishes to make any change OR delete but that must be subject to administrator's approval. It is required to keep transparency. Please do reply. I want to use it like a real program where anything is completed by someone becomes part of the record and can't be altered unless approved by the administrator.