How many licenses do I need?

How many licenses do I need?
Normally just one.

You may use one license on up to 3 PCs as long as there is only one 'main computer'. If more than a total of 3 computers are synchronized by their main computer, you 1 license of each additional computer. Example: 1 main computer + 4 other computers => 5 computers => 3 licenses.

If different persons (e.g. in the office) need to control their own sync, you need one license per person (=per 'main computer'). Example: 5 colleagues with desktop and notebook => 5 licenses.