Safety device for cassettes

Safety device for a cassette for a compact disc, or a cassette tape, which cassette comprises two hingedly interconnected rectangular cassette halves, said safety device being intended for mounting on the outside of a said cassette encircling said cassette to prevent opening thereof and being provided with a lock member for locking engagement with said cassette, said safety device having magnetically operated latch means, wherein said lock member comprises a rotary bolt enclosed in a lock housing to be adjusted between an engaged position and a disengaged position from the outside of the lock housing, and that a spring blade of magnet material is provided as a latch member for the rotary bolt, said spring blade being arranged to prevent rotation of the rotary bolt from the engaged latching position and being operable against spring bias from said latching position by magnetic attraction from the outside of the lock housing thereby unlatching the rotary bolt to allow rotation of the rotary bolt to the disengaged position.