Do not use adhesive labels on optical media, since they may separate and damage an optical drive. Printing directly on inkjet-writable CD-Rs or DVD-Rs is a good way to provide information such as your copyright, usage license, file lists and disclaimers.
Often speed and convenience requires delivery by File Transfer Protocol (FTP) or a web-based service. Although not a preferred method, e-mail delivery usually works if image files are small in number and size and if both sender's and recipient's internet service providers permit large attachments. E-mail delivery sometimes works better if the image files are first compressed using lossless compression software such as WinZip or Stuffit. Check to make sure the recipient can access your specific version of compressed files. Delivery by FTP or e-mail usually precludes delivery of a guide print (see next section), so always include a disclaimer that states, "Accurate viewing and reproduction depend on the recipient properly applying ICC color management."
It is important to provide a ReadMe file in PDF, HTML or TXT format with all files delivered for output. The accompanying file should specify image size(s), color space(s), the copyright owner's contact information, any licenses granted (or PLUS code), and for a limited license, the words "other uses, reproduction or distribution are specifically prohibited." The ReadMe file should also include disclaimers noting recipients are responsible for following an ICC-based color management workflow.