[lovelymono]

0-clause BSD goes even further, and completely omits the attribution requirement:

   Permission to use, copy, modify, and/or distribute this software for any
   purpose with or without fee is hereby granted.

   THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
   REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
   AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
   INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
   LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
   OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
   PERFORMANCE OF THIS SOFTWARE.

[bombcar]

Ah, so boost is somewhere between zero and one clause BSD.

[notpushkin]

One major difference between Boost and e. g. MIT is, Boost allows you to omit attribution in binary form (but not source form).