1Blackfriday is distributed under the Simplified BSD License:
 2
 3> Copyright © 2011 Russ Ross
 4> All rights reserved.
 5>
 6> Redistribution and use in source and binary forms, with or without
 7> modification, are permitted provided that the following conditions
 8> are met:
 9>
10> 1.  Redistributions of source code must retain the above copyright
11>     notice, this list of conditions and the following disclaimer.
12>
13> 2.  Redistributions in binary form must reproduce the above
14>     copyright notice, this list of conditions and the following
15>     disclaimer in the documentation and/or other materials provided with
16>     the distribution.
17>
18> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19> "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20> LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21> FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22> COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23> INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24> BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25> LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
26> CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27> LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
28> ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29> POSSIBILITY OF SUCH DAMAGE.