Security - Adobe Acrobat and PDF for Architecture, Engineering, and Construction - page 123

4. It is linked to the document file in such a manner that changes are readily determined and
visually displayed if any data contained in the document file was changed subsequent to the
electronic seal, signature and date having been affixed to the document: and
5. Changes to the document after affixing the electronic seal, signature and date shall cause the
electronic seal, signature and date to be removed or altered in such a way as to invalidate
the electronic seal, signature and date.
B.1.b. In addition, once the electronic seal, signature and date are applied to the document, the
document shall be in a view-only format, if the document is to be electronically transmitted.
As you will see in this chapter, the security and digital signature capabilities in Acrobat are able to meet
all of the regulation's requirements.
In this Chapter
Acrobat 5 and 6 include both Password and Certificate Security; Acrobat 7 has added the ability to use the
Adobe Live Cycle Policy Server. In this chapter you will learn how to work with a range of security
methods:
x Password Security is the most familiar method of securing a document. In Acrobat, you can create two
levels of passwords for controlling access to both opening and modifying a document.
x Certificate security is based on digital signatures created in Acrobat. In addition to creating certificates,
you can also exchange them, set specific rights, and examine their contents.
x Certificate security can be applied in two ways, either as a signature, or as a certifying signature. Both
signature options use the same process and encryption method; the difference lies in the order of
signing, as only the first signature on a document can be defined as a certifying signature.
x Digital signatures can be customized, using combinations of the signature elements provided, optionally
accompanied by a custom graphic image.
x Rather than recreating a set of parameters to apply with a signature or password each time it is used,
you can create a policy that is stored in Acrobat and available for use as needed.
x Document attachments can be encrypted separately from the rest of a document using an eEnvelope.
x File versions based on existing content at the time of signing can be compared.
Using Password Security
Most forms of security used in Acrobat are based on permissions. That is, a user is granted the right to open
a document and make allowable modifications. Unlike other security options available in Acrobat, using
password security can protect the contents of a file against changes anonymously. You can also control
access to the document using a Document open password.
Applying Password Security
There are several approaches to applying security in Acrobat; the simplest method to add a simple
password is through the Document Properties dialog box.
Follow these steps to apply password security to a document:
1. Choose File > Document Properties > Security to open the Document Properties dialog box.