Joker were a budget Australian label that released live bootlegs, due to a loophole in the law in Australia. This law is why each disc has text scrawled across the front cover saying that it is unofficial. They released a few Beatles and Beatles related material.
SM 3591 - The Beatles & The Rolling Stones - At The Rarest
JOK-038-A - Paul McCartney - Paul McCartney Live Vol. 1
JOK-042-A - John Lennon - John Lennon Live Vol. 1
JOK-042-B - John Lennon - John Lennon Live Vol. 2
JOK-043-A - The Beatles - The Beatles Live Vol. 1