Can my brother in law add music to my flash drive from his own or my in-laws collection? What about cds that I own already? Would it change anything if I frequently borrow cds from him/them?
Cd’s that you already own may be transferred to your flash drive because you are not taking away a sale from the producer, since you already bought it. Regarding taking songs from other people please see the following link where a similar question was discussed. https://dinonline.org/2015/03/04/copying-onto-ipod/