Export or archive contacts in Contacts on Mac
Import contacts into Contacts on Mac
Gmail help vCard
Office support vCard
Find Patterns in text on Lion
vCard Editor Trial is a signed application by the develope ID, and a sandbox application.
An application which is not signed is blocked for installing by a Gatekeeper.
The Gatekeeper is a secrity feature introduced from Mac OS X 10.7.5 Lion to help protect your Mac from malware and misbehaving apps downloaded from the Internet.
Safely open apps on your Mac
vCard Editor2 and vCard Editor2 Trial are sandbox applications too. It is prohibited by the sandbox to access to the Internet.
What Apple's sandboxing means for developers and users