You should re-read my post. I said that there were standards for digital redaction which are considered sufficient and equivalent to physical redaction. Break. If you still want to manually redact... iow, manual redaction is a waste of time, but if you have time to waste here's an effective way to waste it.

May is a pretty clear clue that the security "advice" which follows is fud. Your house may flood even if it's on top of a high hill, buy my insurance product.