This is a course-notes archive, not a software project, so "security" here mostly means sensitive content:

• Accidentally published homework/exam solutions or OJ reference programs
• Copyrighted material that should not be redistributed
• Personal information (names, IDs, grades) appearing in scanned documents

If you spot any of the above, please report it privately via GitHub private vulnerability reporting (preferred), or through the contact channels on kaichen.dev — rather than opening a public issue that would draw attention to the content before it is removed.

Reports are typically handled within a few days. Thank you!