License check under VB IDE?

When I tried to open a form (like frmMyForm ) under VB6 IDE, a license window popup saying a license file could not be found(I got this message after moving the project to another machine).

I am wondering what is the feature/code used behind this check? This sounds related to programming for VB IDE. Is it really secure?

Thanks

This error is caused by an ActiveX control being used on the form. Some controls (.ocx files) appear on your machine when you install applications from third-party vendors. (Macromedia, for example, will install ocx's for playing swf files) These controls appear to be available in Visual Basic for use in your own apps; you probably used one even though you don't really have license to do so.

If the control was marked "Require License Key" when compiled, then each machine it runs on needs to have a license key installed in the registry (which you get by installing a copy of the software which provided the control in the first place).

Point is: if you use a licensed control in one of your apps, the control will only be available to users who have actually licensed the control.

Do you have a datagrid on your form?