it's not ANSI that is offering the free copy. The standards body for US forklifts currently and officially is maintained by ITSDF.
ITSDF= Industrial Truck Standards Development Foundation, and at their website itsdf.org, you can download the standards as long as you agree not to resell them.
So while ANSI and ASE standards wanted something more valuable than your first born for a peek, I think ITSDF has a bit of a different focus, and seems to believe that we will all be safer if we are smarter, and that the information should be freely available to us, so we can argue the fine points...
ANSI only pointed to the ASE B56.1 standard and incorporated it by reference.