Hi, i want to sell php scripts/ready made sites in the near future on clickbank and on my sites and i wanted to know is it necessary to go to a copyrights office to protect my work? and to stop people from selling it? i was thinking to have a license txt file that tells buyer not to sell and etc instead of going to a copyrights office.i understand how copyrights work but i don't know if i can stop the person from selling and claiming my stuff without having ownership proof from the copyrights office. I might sell some stuff that doesn't have restrictions.thanks