The GPLv2 license is not compatible with GPLv3 license, as they are both copyleft but they are not allowing license-switching from one to the other [1]. The original dcfake77.c states in its header "GPL v2+", I'm assuming that this permits the switching to "GPLv3 and later versions".
The GPLv2 license is not compatible with GPLv3 license, as they are both copyleft but they are not allowing license-switching from one to the other [1]. The original dcfake77.c states in its header "GPL v2+", I'm assuming that this permits the switching to "GPLv3 and later versions".
[1] Why Upgrade to GPLv3