Adobe 62000112DM User Guide - Page 288

ADOBE ACROBAT 3D VERSION 8 281 User Guide 6 Save the PDF using a different name than the original, and close the document without making any further changes. If you save the document a second time, your signature must be verified by using the View Signed Version option in the Signatures panel. (See "View previous versions of a signed document" on page 286.) View a PDF in Preview Document mode 1 Choose Advanced > Sign & Certify > Preview Document. 2 In the document message bar, click View Report (if available) and select each item in the list to show details. When you're done, click Close, and then click Exit. Before you certify a PDF Document authors can improve document integrity and ensure that their documents remain certified by addressing the following issues before they certify PDFs: • Disable or remove content that could modify the document or compromise its integrity, such as JavaScripts, actions, or embedded media. • If you intend for others to sign the document, enable usage rights to let Adobe Reader users add a digital signature (choose Advanced > Enable Usage Rights In Adobe Reader). • Certify or sign a PDF only after you make final changes to it. If you make changes or resave the PDF after you sign it, you may compromise the validity of your signature or the document's certified status. Document authors can use Adobe LiveCycle Designer (Windows) to create signature fields that lock after signing, preventing changes that may invalidate signatures. For more information, see Adobe LiveCycle Designer Help. See also "Examine a PDF for hidden content" on page 248 Certify a PDF When you certify a PDF, you indicate that you approve of its contents. You also specify the types of changes that are permitted for the document to remain certified. For example, suppose that a government agency creates a form with signature fields. When the form is complete, the agency certifies the document, allowing users to change only form fields and sign the document. Users can fill in the form and sign the document, but if they remove pages or add comments, the document doesn't retain its certified status. You can apply a certifying signature only if the PDF doesn't contain any other signatures. Certifying signatures can be visible or invisible, and are indicated by the blue ribbon icon in the Signatures panel (and if visibly signed, in the signature field). A digital ID is required to add digital signatures (see "About digital signatures" on page 275.) 1 Change the default signing method, if needed. 2 Click the Sign button in the Tasks toolbar and choose one of the following options: • Certify With Visible Signature. • Certify Without Visible Signature. If you choose this option, your signature appears only in the Signatures panel.