There has been a marked increase in hacked YouTube channels inside Japan, as cybercriminals target viewers' personal computers by installing malware to steal personal information and passwords for use in cybercrimes.
Yuji Okawa, 36, from Gero, Gifu Prefecture, posts videos of himself playing with his pet cat and dog on his YouTube channel, called "perorins."
In April, he received an email in English from someone claiming to be a YouTuber, telling him he could more effectively monetize his platform by "changing the method of calculating (your) income."