What are the differences between 1 PC and 2PC?

•  1PC: This is a license key which is intended for one device only and can be activated for one device only. 
• 2PC: This means if you have e.g. a PC and possibly a second or a laptop the 2 PC version is the better choice for you. This allows you to activate your license key on both devices. 

This also applies if you have two or more operating systems on one device. Dan each operating system is to be considered as two or more separate devices.

1 PC = 1 operating system / device

2 PC = 2 operating systems / devices