This from an older report:

"As for remaining independent, Liberty has also employed a poison pill, Nash said. If an unsolicited offer for 20% of more of Liberty materializes, then existing shareholders will have the right to buy relatively cheap shares, which would dilute any offer.

"It would cost (an acquirer) a lot of money to proceed," he said. "So, if we don't want to make a deal, we have a way of saying, 'Leave us alone.' ""