Shortly: the problem is (was!) that book authors or distributors can collect information about how many times pdf book was used. And what is more, script inside the pdf sends information about place where those books are in hdd, readers IP and sets cookie for further spying.
So I decided to put a period for such pdf spy agency.
My little present for www.AvaxHome.ru community:
UPDATED fast version!
With SafePDF you can easily analyse any pdf and shut off scripts inside the file before it even starts. A program analysis content of pdf file without real opening it and gives opportunity to disable suspicious scripts. After that you can safely use pdf file with any favorite pdf reader with no fear to lose any personal data.