This is the standard pricing, which applies to all costumers except those meeting the criteria for governmental/NGO, educational or student pricing.
This pricing level applies to public institutions, charitable organizations, NGOs and their employees.
Educational pricing is available for educational institutions like universities, colleges, any kind of schools and their employees.
This extremely-reduced pricing is only available for students enrolled in a graduate or post-graduate program and cannot be upgraded or installed on more than one computer. More info