Altium Designer SE offers complete front-end schematic capture design. It also allows the user read-only access to view the full board layout. Outputs can still be generated, but only for limited documentation.
Time-based license allows the user to use the licensed software for a specified period of time. The license is entitled to updates while the license is active.
Perpetual license allows the user to use the licensed software indefinitely. The license is entitled to future updates as long as it stays on subscription with Altium Designer.