After a quick mail exchange with the author of
PicCon, I'm happy to announce that he agreed on releasing it as Public Domain.
There's a catch, though: He doesn't have the sources, binaries nor the key generator anymore. So, if anyone out there has a registered version, you are free to spread this as you please.
I might have a registered copy on an old HD, and if I find it, I will make it available somewhere.
Hooray!