How do I get this "permission" thingy that apparently is required to draw on the Lascaux Sketch Large board? Cos I'd really like to be able to draw there.

The lascaux large board should be considered an advanced board, made specifically for testing and demo'ing to select artists. In general a wide range of skills in both drawing and using the applet should be demonstrated to get access. Because the images take up so much space (which we are quickly running out of), I'd rather not lightly give access to the board.