https://www.theregister.co.uk/2019/08/02/apple_facetime_patent_appeal/

Apple has lost its fifth legal appeal against the holder of network protocol patents, VirnetX, inching the case forward one judgment at a time.

This time a US federal court agreed [PDF] with the Patent Trial and Appeal Board (PTAB) that two patents owned by VirnetX were in fact valid. It has previously – and repeatedly – been decided that Apple infringed those patents in its FaceTime video-conferencing and as a result has been ordered to pay VirnetX over $1bn in damages.