DSM-G600 from D-Link (Wireless G Network Storage Enclosure) violates GNU GPL ?

[Mailing metyl]

Hi all !
I wanted to buy some wireless network storage and it found something 
interesting in firmware of
Wireless storage DSM-G600 from D-Link (Wireless G Network Storage 
Enclosure) looks like uses linux and also samba server
D-link officialy sells this device with only Windows support in two 
versions (both have different firmware)
but in booth is visible that linux kernel 2.4 was used as an OS in those 
devices.
Version A is easy to extract (tar xvf ) and contains those files:
ip-ramdisk
rootfs.gz
usr.cramfs
version.msg

in rootfs.gz is gzipped ext2 root filesystem and in usr.cramfs is /usr 
ROM filesystem
this version uses atheros wifi driver and many thinks here, samba, 
busybox, sysutils

Version B is in some other format but its also evident thats linux 
distribition


Is this normal, selling device with GNU linux and does not provide 
sources ?
Please take a closer look on this, cause by my opinion this is so called
GNU licence violation ......

Metyl