Dear Manish,
"Copyright shall subsist in any literary, dramatic, musical or artistic work (other than a photograph) published within the lifetime of the author until fifty years from the beginning of the calendar year next following the year in which the author dies". The Copyright is liftime plus 50 years and in some countries 60 years after the death. If this is the case then book might not have copyright issue. Check, when did the author die. Please note this is only for coyright issue in literay work. However, Junglebook TV serial must have copyright since, it is a combination of literary, dramatic, musical or artistic work and constitute a totally seperate work.
Take the advice of a good copyright lawyer to avoid any infringment issue
Regards,
Iftikhar Ahsan
9873446651