It's very important for me to learn a way for checking if a user is using a VPN.
In my software different users get access to the same database through Microsoft Network (a shared folder).
Currently this software can detect if the database is located on an hard drive or on the network.
For (local) network i release a FREE license of my software.. so some users are began to use VPNs to simulate LAN and they get free UNAUTHORIZED access to my software.
It's became important for me to be able to detect such circumstance in some way.
Thank you so much in advance, and plz excuse my bad english.