The Historical Permission Notice and Disclaimer (HPND)[3] is an open source license, approved by the Open Source Initiative (OSI) and verified as GPL-compatible by the Free Software Foundation.
It lets the licensor pick anywhere from 0-2 warranty disclaimers, whether they want to prohibit the author's name from being used in publicity or advertising surrounding a distribution (like in the BSD License), and other spelling and grammar options.
Variants of this license are in use primarily in older software, including the original BSD kernel.
This is the only OSI-certified license (excluding the public domain) that can lack a disclaimer of warranty.
The license was deprecated by its author, Bruce A. Dodson, prior to 24 September 2009.