User manual

Opening Adobe PDF documents with security restrictions
When you receive a PDF document that is protected by security restrictions, you may
need to authenticate your identity or type a password before you can open the document.
In addition, some protected documents may prevent you from printing, editing, or copying
content in the document. You can discover the protection settings by holding the pointer
over the padlock icon that appears in the lower left corner of protected documents. When
a document has restricted features, any tools and menu items related to those features are
dimmed. If you're having trouble opening a PDF document, or if you're restricted from
using certain features, contact the PDF document author.
For more information on security features in Acrobat, see About security.