Fishkin’s Yggdrasil nodes pinger (including all files in the archive downloadable from this site) is distributed by the licence Creative Commons Attribution Share-Alike (CC BY-SA) 4.0.
It means interalia:
- you can freely use and distribute Fishkin’s Yggdrasil nodes pinger and based on it derivative works;
- at distributing, you must indicate the name of the author of the original work (Gamliel Fishkin) and use the same licence.
CC BY-SA is a libre licence. You can know more about it at the link above. (The best licence for software is GNU GPL, but it requires to attach its text to the distributed programme, what would increase noticeably size of downloaded file.)
Fishkin’s Yggdrasil nodes pinger is provided by the principle «as is», without warranties and obligations.