Love them or hate them they make life for some interesting and have no effect on others.
Kill rights are given to anyone who is podded in Low Sec or ship is destroyed in High Sec.
This kill right is basically a free pass to make the offender a legitimate target in either Low or High Sec for 15 minutes. This enables anyone to shoot him/her.
John now has 26 kill rights against him. 14 are currently active and a number are up for sale from between 2 (just 2) and 20 million ISK.
Utterly pointless while I have a security status of -9.3. I can never go to high sec, and anyone can shoot me elsewhere with no penalty.
But such is life. (or death)