All downloadable standards are watermarked. The ISO Central Secretariat uses watermarks in order to protect  ISO's Copyright. A watermark is additional information that has been added to a document to identify the rightful licensee of the document. Using a watermark is a means of personalizing each standard that you download. By default, the watermark in the PDF file displays (on each page of the document) the order number, the download date and the email address of the contact provided in the Account. Example of a watermark: