Geoffrey Cox's advice, intended for Theresa May's eyes only, is starker than the advice which was issued to the House of Commons.
A summary of the advice offered to the government was given to parliament this week, but MPs found ministers in contempt when they refused to release the full document.
After being voted down, the six-page document, a letter written to Mrs May on 13 November, was released shortly after 11.30am on Wednesday.
Its warnings seem to be far starker than the 43-page "summary" seen earlier this week.
The full document is available below, with the key points highlighted and analysis from Sky experts and MPs.