By purchasing iWay DQC, you obtain the license key (a file with a .plf extension). When iWay DQC core starts, it looks for this file first in the installation folder, then in the home folder of the current user, and finally in the folder defined by the PURITY_HOME system variable.

Each license file may contain several restrictions, such as the operating system, iWay DQC version, or date validity range. A license file is valid only if all its conditions for use are met. Additionally, a license file may contain a restriction on product functionality. Functionality not covered by the license file is reported as an error by both the GUI and core.

If no matching license key is found, iWay DQC exits with an error.