I know 3 ways in Adobe Illustrator to crop vector artwork, seamless pattern etc:
Crop in Pathfinder panel. But it is a destructive method. All shapes cut each other like confetti :)
Divide Objects Below. Unfortunately this method very laborious. I should manually delete all external shapes.
Clipping Mask - but buyer might have a problem with it.
So what method do you use? And do anybody use Magic Eraser script for automatically crop? It is new tool for illustrator which automatically cuts and deletes paths and shapes outside Artboard.