diff --git a/pdf/41. Hacking Exposed - Windows Security Secrets & Solutions.pdf b/pdf/41. Hacking Exposed - Windows Security Secrets & Solutions.pdf new file mode 100644 index 0000000..01cd38f Binary files /dev/null and b/pdf/41. Hacking Exposed - Windows Security Secrets & Solutions.pdf differ diff --git a/pdf/42. Hacking Exposed - Network Security Secrets & Solutions.pdf b/pdf/42. Hacking Exposed - Network Security Secrets & Solutions.pdf new file mode 100644 index 0000000..8f33640 Binary files /dev/null and b/pdf/42. Hacking Exposed - Network Security Secrets & Solutions.pdf differ diff --git a/pdf/43. Information Security - Principles and Practice.pdf b/pdf/43. Information Security - Principles and Practice.pdf new file mode 100644 index 0000000..1cb0283 Binary files /dev/null and b/pdf/43. Information Security - Principles and Practice.pdf differ diff --git a/pdf/44. Nessus, Snort and Ethereal Power Tools.pdf b/pdf/44. Nessus, Snort and Ethereal Power Tools.pdf new file mode 100644 index 0000000..4c32b3d Binary files /dev/null and b/pdf/44. Nessus, Snort and Ethereal Power Tools.pdf differ diff --git a/pdf/45. Active Defense - A Comprehensive Guide to Network Security.pdf b/pdf/45. Active Defense - A Comprehensive Guide to Network Security.pdf new file mode 100644 index 0000000..6e28860 Binary files /dev/null and b/pdf/45. Active Defense - A Comprehensive Guide to Network Security.pdf differ