Leaning and eating

Q: I heard an Aalim say that the Kitaabs of hanafi fiqh state that there is no problem with eating while leaning.

1.What does this mean?

2. The Hadith that mentions we must not lean and eat. What type of leaning does it refer to?

Protection from jinn

Q: My question is that one of my friends gave me two copies of letters of Holy Prophet (Sallallahu Alayhi Wasallam) to the jinnaat for protection purposes because once a tragedy happened to me. One copy is translated and the other is not. One's Arabic words are different from the other. Similarly there are some Arabic duas which we learnt but the same are quite different or some extent different from what we read elsewhere. Is it permissible to recite these duas?