Dr.Explain Perpetual Licenses are licensed on "per Windows user account" schema. The Home License is for single purchases, images show a small label and it does not include collaboration on projects, projects created with the Business license are read only.
Basic maintenance is free for all users and includes email support. All minor updates (e.g., 6.1, 6.2, 6.5, ... 6.x) are free. There may be charges for major updates for those who ordered more than 12 months ago.