Due to some people asking about pdf apps. $ V+ f4 k. Z L3 Z" _ I use android apps " repligo reader "which has the highlight feature on playbook,but playbook has bugs 8 C+ x$ U5 Y. z! E# L. [) y...; C0 \, R0 Y8 x" p& A; _9 ~$ \
also I use goodreader for ipad...