Former News of the World royal editor, Clive Goodman, has told the Old Bailey he was "pretty cross" with Andy Coulson, News International and the News of the World but that faded by the time he got out of prison.
Explaining his feelings now, he said: "Purely in the interest of self-defence, I have had to say things which cause me some pain, really, to be honest. There it is, I have no choice.
Goodman, 56, of Addlestone, Surrey, denies conspiracy to commit misconduct in public office.
Coulson, 46, of Charing, Kent, denies conspiring to hack phones and commit misconduct in a public office.
All the other defendants in the case deny the allegations against them.
The trial was adjourned until tomorrow.
More top news
A mother who told her son she was going to the supermarket - before flying to Australia - has been given a six-month suspended sentence.
The three-point turn and reverse around a corner could be out - but parallel parks are still in - under plans to overhaul driving tests.
The teaser trailer for Star Wars VII: The Force Awakens has premiered online and in US cinemas.