curl -O https://img-en.fs.com/file/user_manual/fs-ap3000c-comb-v200r104c60b306sp03-2012.bin.zip
unzip fs-ap3000c-comb-v200r104c60b306sp03-2012.bin.zip
binwalk -e FS-AP3000C-comb-V200R104C60B306SP03-2012.bin
cd _FS-AP3000C-comb-V200R104C60B306SP03-2012.bin.extracted
ubireader_extract_images 29C0.ubi
cd ubifs-root/29C0.ubi
ls
mkdir rootfs
unsquashfs  -d rootfs/ -f ./img-674820164_vol-ubi_rootfs.ubifs
strings rootfs/bin/busybox|grep GPL -b1

############### This outputs following license text ########################
# 4345-BusyBox is copyrighted by many authors between 1998-2012.
# 4403:Licensed under GPLv2. See source distribution for detailed
# 4462-copyright notices.
############################################################################