I understand that Adobe Reader is very vulnerable to the cyber-criminals. I also really dislike how heavy and sluggish it is. So what is my best alternative? I want something that's 1. more secure than Adobe 2. much lighter and faster 3. as good as Adobe in terms of allowing one to highlight and annotate 4. free 5. I want to be able to copy highlighted text to my clipboard. It seems like I used to be able to do that with Adobe.