One can be given Create, Read, Update to individual fields in Dynamics Web forms based on the security profiles.
With the help of security profiles can give permissions to the secure fields, users and teams.
We can configure Security Profile to grant the following permissions at the field level to the
added users or teams:
• Read : With this permission one can have read-only access to the field’s data.
• Create : With this permission one can add data to this field when creating a record.
• Update : With this permission one can update the field’s data after it has been created)
A permissions of read,create,update determines the user privileges for a specific data field.