I'm not going to speak legalese here. It's going to be short and to the point. By purchasing Pocket Dimensions you hereby agree to these conditions:
If something goes wrong with your server (not that it will!) while using this plugin, you will not hold Nikedemos responsible. You use the plugin at your own risk. Always make sure you make backup copies before experimenting with anything.
You are granted a license to use the plugin on up to 6 servers at time. You have to be the owner or co-owner of those servers. This license will never expire. When the plugin gets updated, every license owner is entitled to an update.
You will not distribute this plugin in any shape or form - not on forums, social media, not to your friends, not to other server owners nor other plugin developers. Making plugins takes time and effort and I really appreciate respecting plugin developers by not stealing their work. The only way to legally own and use Pocket Dimensions on a server you own is to purchase a license. If you’re not a permanent co-owner on a particular server (that has been participating in the server costs/revenue), you can’t deploy the plugin there, even if you’re friends with the owner. They have to purchase a separate license.