A problem explanation book specializing in the field of information security. As shown in the third photo, there is one instance of writing with a marker. There appears to be no other writing, but please be aware that there may be oversights. - Title: Only the Important Parts! Applied Information Technology Engineer Afternoon - Series: Information Technology Engineer Examination Series No. 1 - Publisher: EXAM PRESS - Content: Problem explanations related to the field of information security - ISBN: 978-4-7916-6507 Thank you for viewing.