Ok guys, thanks for suggestions ! As far as the permission is concerned- no, I haven't asked Opeth, there are only a few fotos taken from official site, all the rest I've found elsewhere, and it certainly doesn't require any permission from band's side, rather the foto's author but it's my problem, thus don't make me laugh x_Opeth_x telling me about some lawsuit ;-) Apart from that the audio samples have a duration approx. 30 sec so Mike & co wouldn't probably be angry cause on many sites throughout the world you can find it as well (e.q. amazon etc).
Regards !