Adobe ACROBAT READER 7.0 Manual page 142

Signing PDF documents in a web browser
To sign a PDF document on the web, the document must contain an empty signature field.
When you click a signature field, a Sign button appears rather than the Sign And Save and
Sign And Save As buttons, which appear when you sign a document directly in Adobe
Reader. When you sign a document in a browser, only the incremental portion of the file
is saved to your hard drive.
To sign a document in a web browser:
1. From the Sign menu on the Reader toolbar, choose Sign This Document, or click a
signature field, and then follow the steps described in
Reader.
2. If you want to retain a copy of the signed document, click the Save A Copy button on the
Reader toolbar.
Signing PDF documents in Adobe