Originally Posted by twiisted71
one's activity is ignored and the others is endorsed?
Nope, and I'm surprised you're the only one to take a shot.
According to the author, a Privateer is a private, purpose built warship authorized by the Gov't for commerce raiding. A Letter of Marque is an armed merchantman authorized for commerce raiding.
He said it is a subtle difference and one that has often led to confusion for historians doing research. I never heard this before, but it sounds believable and in any case is good trivia.