We use the term privacy when referring to the desire to keep communication from being seen by anyone other than the intended recipients. Some people in the security community avoid the term privacy because they feel its meaning has been corrupted to mean the right to know, because in some countries there are laws known as privacy laws which state that citizens have the right to see records kept about themselves. Privacy also tends to be used when referring to keeping personal information about people from being collected and misused. The security community also avoids the use of the word secrecy, because secret has.
