beatiful creaturs no doubt
however, they are legal to obtain, i am sure.
a few things to know
first, as you ahve mentioned, they are extremely deadly
and can kill a man in minutes without him even knowing he had been bitten
2d, they should have been appropriately named the HOUDINI ocotpus. they are known as being excellent escape artists for sure. But escape artisit is by far an UNDERSTATEMENT. They will get out of any tank, unless actually sealed. just tight fitting lids will not suffice.
3d, they are probably the most intelligent species we can obtain. They can firgure out serious and complicated locks and doors in order to get out.
I can remember one time watching a video, where (in a lab) fish were disappearing and there was no explanation at all. So, the reseachers and lab staff set up cameras. The very first night, they caught the theif. It was an octopus(in what was thought to be a nice tight fitting tand and lid), who was getting out at night and crawling across the floor to get into the other tank that he/she was observing all day and in for a midnight snack. Later to return home before anyone came in to return to work in the morning. No wonder noone was able to figure out he mystery.
I am sure that their motivations and travels will not only be set on that tank across the room, it could be ones bed that they wind up in for a little while.
4th, their life span is very short and they are difficult to keep for any amount of time.
5th, they are not cheap to purchase either, NOT AT ALL
Now, although some of this info may make them seem more intriguing to some, they are NOT a creature to be taken lightly and should not be sought after for a home tank at all. The best advice that can be given is to let them alone, not to mention that they are rare or maybe even endangered, adn letting them in the wild is the best chance that they have for survival. That is one of our other responsibilities as aquariists, to help preserve the life forms that we desire and enjoy.