Copyright
Copyright details for the Salesforce Help and PDF files differ slightly.
Salesforce Help
Each Web page produced by Salesforce must include the Salesforce copyright notice at the bottom.
Example
PDF Files
Printed documentation and PDF files must display the Salesforce copyright notice on either the title page, on the back of the title page, or in a similar location on the front matter.
Example
© Copyright 2000–[current year] salesforce.com, inc. Salesforce is a registered trademark of salesforce.com, inc., as are other names and marks. Other marks appearing herein may be trademarks of their respective owners.