unLocked PDF:
The PDF you uploaded must be unlocked, so sBookstore system have permission to encrypt.
About memory:
The page size of PDF: less is better.
Index:
Support index link(jump to page number:Microsoft Word,Openoffice Word,Indesign,Acrobat...)
Embedded Web Page:
Use Acrobat/Mac:Preview,"http://"→"fpkw://",EX:"http://sayhong.net"→"fpkw://sayhong.net"
Youtube Videos:
"utube://",http://www.youtube.com/watch?v=amNBRCrf2eg
→"utube://amNBRCrf2eg"
PS:You can set your youtube video to private.
Video in internet:
"http://video-js.zencoder.com/oceans-clip.mp4"→"fpky://video-js.zencoder.com/oceans-clip.mp4"