/usr/share/doc/libusb-java-doc/html/ch/ntb/ is in libusb-java-doc 0.8+ztex20090101-7.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/Device.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/LibLoader.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/LibusbJava.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/USB.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/USBException.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/USBTimeoutException.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/Usb_Bus.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/Usb_Config_Descriptor.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/Usb_Descriptor.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/Usb_Device.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/Usb_Device_Descriptor.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/Usb_Endpoint_Descriptor.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/Usb_Interface.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/Usb_Interface_Descriptor.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/Utils.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/package-frame.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/package-summary.html
/usr/share/doc/libusb-java-doc/html/ch/ntb/usb/package-tree.html