Redaction
/rɪˈdækʃn/
Definition 1 of 2
Pro Tip 1/3Privacy Protection
Redaction is often used to protect personal or sensitive information from being disclosed. 
Social security numbers were redacted from the database.
Pro Tip 2/3Legal Documents
Legal and official documents frequently undergo redaction to comply with privacy laws. 
The legal contract had several redacted sections.
Pro Tip 3/3Blackout Lines
In redacted texts, information is often concealed with black lines. 
The witness's name was covered by a blackout line.