Seedbox is akin to having a server in other countries where in u can connect to and download content in great speeds without any restriction of laws for the content.
Typically they are present in the EU contries.
As the content is downloaded in the designated servers, u are safe in ur country.
So u can download anything and copy it back to ur machine.
Care needs to be taken so that the transfer between seedbox and ur machine should be secure, else it is of no use!