Dr.Explain Annual License is licensed on "per Windows user account" schema, per year. The application is installed into a certain Windows user account. Therefore, you need a license for every Dr.Explain installation, even if all the installations were made on a single physical PC.
Premium maintenance is included and all updates (minor and major) for the duration of your license term.
To continue to use the software you will need to purchase an Annual License Renewal each year.