Paperclip processor for adding copyright info to uploaded files

add_copyright_exif.rb

# lib/paperclip_processors/add_copyright_exif.rb

# Requires:
#   gem paperclip
#   gem mini_exiftool
#   exiftool (command line util)

module Paperclip
  class AddCopyrightExif < Paperclip::Processor
    
    def make
      # add exif data
      f = MiniExiftool.new @file.path
      f.copyright = "Copyright info here"
      f.save
      # return file for future processors
      @file
    end

  end
end

production.rb

#config/environments/production.rb
# add exif data to paperclip uploads
config.paperclip_defaults = {
  processors: [:add_copyright_exif],
}