# SWI-Prolog copyright

As of version 7.3.33,  SWI-Prolog  is   covered  by  the  Simplified BSD
license:

--

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

--

## Possible additional license requirements

Note that SWI-Prolog may be linked with libraries covered by more
restrictive license and therefore the above conditions may not suffice
for a particular version of SWI-Prolog or a program loaded into
SWI-Prolog. Run the following predicate to find which components with
additional requirements are loaded into a particular version.

  ```
  ?- license.
  ```

The core can be configured to exclude all known GPL and LGPL components
using one of these options. Excluding `lgpl` also excludes `gpl` and
thus produces a core system that only contains code distributed under
a permissive license.


  ```
  ./configure --without-gpl
  ```

or

  ```
  ./configure --without-lgpl
  ```