Closed Source                                          Open Source
                          System                                              System
                 more security threats                              better security  with great
                    due to widespread                                    community support
                              used
                      user code kept                                          user code is
                             secret                                        freely-distributed
                                                                         requires extensive
                         easy to use                                            knowledge
                requires a paid license                                       free to use
                              e.g :                                                  e.g :
                   Microsoft Windows                                                Linux
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