Thanks for your response Klas.
Maybe I explained wrong, I have 4 users must update the same form.
Example: the first user enters 10 fields, the second user sees only input fields (without being able to upgrade), and in turn enter other three fields ..... and so on for other users. I hope I was clear.
Have you any suggestions? Thanks for the answers.
If you would like to have conditional variation on the field so that some fields are Readonly depending on the user or usergroup, I'm afraid this is not possible directly, but - you can create 2 instances of each field with the same storage, one with normal variation and other with readonly. Then you can use this plugins