score points of honor through diplomatic means: to do so, you must own 5 diplomacy cards of other families (military support, family member or trading). These may come in any combination, provided each color other than your own is represented. By returning them to their
initial owners, you forego the possibility of claiming the associated privileges. This attitude is particularly honorable and earns you 10 points of honor. Moreover, each player having been returned a card in this manner loses one point of honor.
page 10, paragraph 3
I added in the boldThanks. Looks like you are correct. I will get a correction posted.
I can think of at least one simple exploit if you play it the way I explained so that does make sense but I also think that it makes it unlikely that people would choose this action very often.