One more thing to add, you could always print out your pictures and mail them to yourself by registered mail and then they belong to you. They are dated and you could sue someone if you wanted to, because you have proof, that the pics are yours.
JUST DON'T OPEN THE LETTER WHEN YOU RECEIVE IT BACK, IT ONLY GETS OPENED IN FRONT OF A JUDGE, IN COURT.
If you don't want any one to gets your pics, don't release them. "Nothing is impossible!"