Is the Zfone application available under the GPL or AGPL?
No. Zfone is a complete software application for end users that showcases the libZRTP SDK. Our libZRTP SDK is a subroutine library for developers that implements the ZRTP protocol, and is available under the AGPL. But the rest of the Zfone application, which is not part of the libZRTP SDK, is not licensed under the AGPL, the GPL, or any other Open Source license.