The number of seats is determined by the number of computers or users, whichever is lower.
The Single license permits either a single user to use the software on multiple computers or multiple users to use the software on a single computer. However, it does not allow multiple users to ever use the software on multiple computers, regardless of whether such use is concurrent.
The Multi license permits multiple users to use the software on multiple computers. The number of required licenses is determined either by the number of computers where the software is installed or by the number of persons using these computers – whichever number is the lower.