There isn't.. but, decompiling maps doesn't work.
Sure, you get the image of how the map works - but a decompiled map can't be compiled - decompiling creates all sorts of errors (Hollow brushes being just one) and mostly fucks up the textures.
If you release a map there is close to no chance your map will get decompiled, changed and re-released - simply because the decompiling technology sucks, to this date.