COPYING -- Describes the terms under which Nmap is distributed.          
                                                                          
IMPORTANT NMAP LICENSE TERMS                        
                                                                          
 The Nmap Security Scanner is (C) 1996-2019 Insecure.Com LLC ("The Nmap   
 Project"). Nmap is also a registered trademark of the Nmap Project.      
 This program is free software; you may redistribute and/or modify it     
 under the terms of the GNU General Public License as published by the    
 Free Software Foundation; Version 2 ("GPL"), BUT ONLY WITH ALL OF THE    
 CLARIFICATIONS AND EXCEPTIONS DESCRIBED HEREIN.  This guarantees your    
 right to use, modify, and redistribute this software under certain       
 conditions.  If you wish to embed Nmap technology into proprietary       
 software, we sell alternative licenses (contact sales@nmap.com).         
 Dozens of software vendors already license Nmap technology such as       
 host discovery, port scanning, OS detection, version detection, and      
 the Nmap Scripting Engine.                                               
                                                                          
 Note that the GPL places important restrictions on "derivative works",   
 yet it does not provide a detailed definition of that term.  To avoid    
 misunderstandings, we interpret that term as broadly as copyright law    
 allows.  For example, we consider an application to constitute a         
 derivative work for the purpose of this license if it does any of the 
following with any software or content covered by this license ("Covered Software"):
                                                                          
 o Integrates source code from Covered Software.                          
                                                                          
 o Reads or includes copyrighted data files, such as Nmap's nmap-os-db    
 or nmap-service-probes.                                                  
                                                                          
 o Is designed specifically to execute Covered Software and parse the     
 results (as opposed to typical shell or execution-menu apps, which will  
 execute anything you tell them to).                                      
                                                                          
 o Includes Covered Software in a proprietary executable installer.  The  
 installers produced by InstallShield are an example of this.  Including  
 Nmap with other software in compressed or archival form does not         
 trigger this provision, provided appropriate open source decompression   
 or de-archiving software is widely available for no charge.  For the     
 purposes of this license, an installer is considered to include Covered  
 Software even if it actually retrieves a copy of Covered Software from   
 another source during runtime (such as by downloading it from the        
 Internet).                                                               
                                                                          
 o Links (statically or dynamically) to a library which does any of the   
 above.                                                                   
                                                                          
 o Executes a helper program, module, or script to do any of the above.   
                                                                          
 This list is not exclusive, but is meant to clarify our interpretation   
 of derived works with some common examples.  Other people may interpret  
 the plain GPL differently, so we consider this a special exception to    
 the GPL that we apply to Covered Software.  Works which meet any of      
 these conditions must conform to all of the terms of this license,       
 particularly including the GPL Section 3 requirements of providing       
 source code and allowing free redistribution of the work as a whole.     
                                                                          
 As another special exception to the GPL terms, the Nmap Project grants   
 permission to link the code of this program with any version of the      
 OpenSSL library which is distributed under a license identical to that   
 listed in the included docs/licenses/OpenSSL.txt file, and distribute    
 linked combinations including the two.                                   
                                                                          
 The Nmap Project has permission to redistribute Npcap, a packet          
 capturing driver and library for the Microsoft Windows platform.         
 Npcap is a separate work with it's own license rather than this Nmap     
 license.  Since the Npcap license does not permit redistribution         
 without special permission, our Nmap Windows binary packages which       
 contain Npcap may not be redistributed without special permission.       
                                                                          
 Any redistribution of Covered Software, including any derived works,     
 must obey and carry forward all of the terms of this license, including  
 obeying all GPL rules and restrictions.  For example, source code of     
 the whole work must be provided and free redistribution must be          
 allowed.  All GPL references to "this License", are to be treated as     
 including the terms and conditions of this license text as well.         
                                                                          
 Because this license imposes special exceptions to the GPL, Covered      
 Work may not be combined (even as part of a larger work) with plain GPL  
 software.  The terms, conditions, and exceptions of this license must    
 be included as well.  This license is incompatible with some other open  
 source licenses as well.  In some cases we can relicense portions of     
 Nmap or grant special permissions to use it in other open source         
 software.  Please contact fyodor@nmap.org with any such requests.        
 Similarly, we don't incorporate incompatible open source software into   
 Covered Software without special permission from the copyright holders.  
                                                                          
 If you have any questions about the licensing restrictions on using      
 Nmap in other works, we are happy to help.  As mentioned above, we also  
 offer an alternative license to integrate Nmap into proprietary          
 applications and appliances.  These contracts have been sold to dozens   
 of software vendors, and generally include a perpetual license as well   
 as providing support and updates.  They also fund the continued          
 development of Nmap.  Please email sales@nmap.com for further            
 information.                                                             
                                                                          
 If you have received a written license agreement or contract for         
 Covered Software stating terms other than these, you may choose to use   
 and redistribute Covered Software under those terms instead of these.    
                                                                          
 Source is provided to this software because we believe users have a      
 right to know exactly what a program is going to do before they run it.  
 This also allows you to audit the software for security holes.           
                                                                          
 Source code also allows you to port Nmap to new platforms, fix bugs,     
 and add new features.  You are highly encouraged to send your changes    
 to the dev@nmap.org mailing list for possible incorporation into the     
 main distribution.  By sending these changes to Fyodor or one of the     
 Insecure.Org development mailing lists, or checking them into the Nmap   
 source code repository, it is understood (unless you specify             
 otherwise) that you are offering the Nmap Project the unlimited,         
 non-exclusive right to reuse, modify, and relicense the code.  Nmap      
 will always be available Open Source, but this is important because      
 the inability to relicense code has caused devastating problems for      
 other Free Software projects (such as KDE and NASM).  We also            
 occasionally relicense the code to third parties as discussed above.     
 If you wish to specify special license conditions of your                
 contributions, just say so when you send them.                           
                                                                          
 This program is distributed in the hope that it will be useful, but      
 WITHOUT ANY WARRANTY; without even the implied warranty of               
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the Nmap       
 license file for more details (it's in a COPYING file included with      
 Nmap, and also available from https://svn.nmap.org/nmap/COPYING)