Kerio Network Monitor behaves after installation as fully functional demo version with time limitation to 15 days from the installation day. On expiration of the time, the program will stop collecting the data.
On purchase of the product, you will receive the license key — file with the digital certificate license.key. By importing the key, Kerio Network Monitor becomes full version instead of demo version, and the program can be used on for unlimited time. This procedure can be preformed also after the 15 day trial period has expired and the program is not functional. After importing the valid license key, it will work again in full extent.
Import of the license key is performed in the menu About / About.

Pressing the button Import license displays a dialog for opening the file with the license (license.key). When it is loaded successfully, the information about current license will appear in the section License information:
Identifier of the license (serves e.g. for verification of the license authenticity)
Holder of the license — individual or organization, which bought the product.
The number of users (i.e. IP addresses of the computers in the local network, which will be monitored). If this number is reached the next IP addresses are not monitored and on the start of the viewer a warning, saying that the maximum number of users was reached, is displayed.
Free program upgrade expiration date.
License validity expiration date (applicable for demo versions and time restricted version)
License state: Valid or Invalid. License is invalid if the date of its expiration occurred or the license file was corrupted, etc.
Note: If the license is invalid Kerio Network Monitor does not measure any data. It is still possible to log in the viewer and browse older data (measured in the time, when the license was valid), or perform configuration tasks. By importing a valid license (see above), the program functions will be restored in full extent.