I joked about how Sony would now try to ban felt-tipped pens - only, apparently, legally speaking, they *have* to.
It's in the DMCA.
A felt-tipped pen is legally now a circumvention device.
Along with basically anything that could make opaque markings on a CD. Like, say, whiteout, or paint, or fingernail polish . . . or blood, for that matter :P
I think someone needs to try to enforce this, just to demonstrate how absurd the DMCA is.