Yep, same for me. The interface of Adobe Reader has changed recently, surely "to improve your experience with our application", and signature is not available.
Hi Phyu, I don't think it's possible to join videos in HandBrake but you can use a free tool called Lossless cut to Merge videos without re-encoding or rendering. Here's how it works. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-exJMgBoXVjM.html Thanks!