I think the normal way is upload my package file into asset store and if the customer want to use it,he should pay and then he can download it.
But I can’t know whether he share the package to to others.
Is there any way to put some license information into it or I can stop the illeague use.
:shock:
I’d guess adding of DRM would have more of an effect on sales than pirates.
Of course anyone can share it, and no there’s nothing you can do about it. Welcome to the digital age. 
Worry about your legitimate customers instead, by providing a good product and service.
–Eric
Like Eric said, no need to worry about things you have no influence on. I think the best way to prevent piracy is to choose an appropriate price for your package. Most users won’t search illegal sources if they can get an official, always up to date version for a reasonable price.
Jake
It’s fruitless to use piracy since assets get updated and you’re left with version ploppy poo 0.1 while all the guys who paid are rocking high performance version 3.x !
Piracy can be annoying if you let it be so.
I ve seen one of my assets being downloaded via torrent 500+ times. I ve selled around 200 copies so far.
What does it means to me ? It means that there are at least another 500 prospective customers. Too bad for them that they have an outdated version.
It also means that I choose to rise the price on my assets and ask for an invoice number to those who ask for help.
I submitted new assets and new versions of my existing assets. If they are successful, I ll keep it up. Otherwise, I ll try more.
I choose to put my energy on what I can do, not what I wish to happen.