When you copy a mask from one layer to another it often changes its position. With CopyMask2Layer you can copy masks while keeping them perfectly in place - even if the layers are moving and if the mask path is keyframed.
If you want to apply CopyMask2Layer to a rotobezier mask, you first need to convert it into a manual bezier mask (by disabling the checkbox Layer->Mask and Shape Path->RotoBezier in the AE menu).
CopyMask2Layer works only with 2D layers.
Brilliant script! Love it.Eran Stern, sternfx.com
It is always frustrating when I paste a mask and it has scaled or done some other unanticipated change. I'll look forward to seeing how it will impact my workflow.Jeff Petersen during his beta tests.
I love this script. At first I didn't think it was going to be all that useful but once I used it for awhile I have to say it's one I don't know how I lived without this tool up to now.Jack Tunnicliffe, Java Post Production, on the AE mailing list