Wouldn't that be a jewel to have in one's library. Most of his sermons are available free, recorded in mp3 format. That makes me think that it might be possible to work something out with those who own the copyright.
Of course, all Martyn Lloyd-Jones books are sermons that he preached. Much of his work has not been converted to text from audio. So there would be some editing involved. But Logos would probably has software that could do 75 to 80% of the editing.
What a treasure a Martyn Lloyd-Jones Sermon Library would be.