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When you encrypt a PDF document with a password, a user
must specify the password to open the PDF document in Adobe Reader
or Acrobat. Also, before another LiveCycle operation, such
as digitally signing the PDF document, can be performed on the document,
a password-encrypted PDF document must be unlocked.
重要： If you upload an encrypted PDF document
to the LiveCycle repository, it cannot decrypt the PDF document
and extract the XDP content. It is recommended that you do not encrypt
a document prior to uploading it to the LiveCycle repository.
(See Writing Resources.)
Summary of stepsTo encrypt a PDF document with a password, perform the
following steps:
Include project files.
Create an Encryption Client API object.
Get a PDF document to encrypt.
Set encryption run-time options.
Add the password.
Save the encrypted PDF document as a PDF file.
Include project filesInclude necessary files in your development
project. If you are creating a client application using Java, include
the necessary JAR files. If you are using web services, ensure that
you include the proxy files.
The following JAR files must
be added to your project’s class path:
adobe-livecycle-client.jar
adobe-usermanager-client.jar
adobe-encryption-client.jar
adobe-utilities.jar (required if LiveCycle is deployed
on JBoss)
jbossall-client.jar (required if LiveCycle is deployed
on JBoss)
Create an Encryption Client API objectTo programmatically perform
an Encryption service operation, you must create an Encryption service
client.
Get a PDF document to encryptYou must obtain an unencrypted
PDF document to encrypt the document with a password. If you attempt
to secure a PDF document that is already encrypted, you cause an
exception.
Set encryption run-time optionsTo encrypt a PDF document
with a password, you specify four values, including two password
values. The first password value is used to encrypt the PDF document
and must be specified when opening the PDF document. The second
password value, named the master password value, is used to remove encryption
from the PDF document. Password values are case sensitive, and these
two password values cannot be the same values.
You must specify
the PDF document resources to encrypt. You can encrypt the entire
PDF document, everything except for the document’s metadata, or just
the document’s attachments. If you encrypt only the document’s attachments,
a user is prompted for a password when they attempt to access the
file attachments.
When encrypting a PDF document, you can
specify permissions that are associated with the secured document.
By specifying permissions, you can control the actions that a user
who opens a password-encrypted PDF document is allowed to perform.
For example to successfully extract form data, you must set the
following permissions:
PASSWORD_EDIT_ADD
PASSWORD_EDIT_MODIFY
注意： Permissions
are specified as PasswordEncryptionPermission enumeration values.
Add the passwordAfter you retrieve an unsecured PDF document
and set encryption run-time values, you can add a password to the
PDF document.
Save the encrypted PDF document as a PDF fileYou can save
the password-encrypted PDF document as a PDF file.
Encrypt a PDF document using the Java APIEncrypt a PDF document with a password by using the Encryption API
(Java):
Include project files.
Include client JAR files,
such as adobe-encryption-client.jar, in your Java project’s class
path.
Create an Encryption Client API.
Get a PDF document to encrypt.
Create a java.io.FileInputStream object
that represents the PDF document to encrypt by using its constructor
and passing a string value that specifies the location of the PDF
document.
Create a com.adobe.idp.Document object by
using its constructor and passing the java.io.FileInputStream object.
Set encryption run-time options.
Create a PasswordEncryptionOptionSpec object
by invoking its constructor.
Specify the PDF document resources to encrypt by invoking
the PasswordEncryptionOptionSpec object’s setEncryptOption method
and passing a PasswordEncryptionOption enumeration value
that specifies the document resources to encrypt. For example, to encrypt
the entire PDF document, including its metadata and its attachments,
specify PasswordEncryptionOption.ALL.
Create a java.util.List object that stores
the encryption permissions by using the ArrayList constructor.
Specify a permission by invoking the java.util.List object
‘s add method and passing an enumeration value
that corresponds to the permission that you want to set. For example,
to set the permission that lets a user copy data located in the
PDF document, specify PasswordEncryptionPermission.PASSWORD_EDIT_COPY.
(Repeat this step for each permission to set).
Specify the Acrobat compatibility option by invoking the PasswordEncryptionOptionSpec object’s setCompatability method
and passing an enumeration value that specifies the Acrobat compatibility
level. For example, you can specify PasswordEncryptionCompatability.ACRO_7.
Specify the password value that lets a user open the encrypted PDF
document by invoking the PasswordEncryptionOptionSpec object’s setDocumentOpenPassword method
and passing a string value that represents the open password.
Specify the master password value that lets a user remove encryption
from the PDF document by invoking the PasswordEncryptionOptionSpec object’s setPermissionPassword method
and passing a string value that represents the master password.
Add the password.
Encrypt the PDF document by invoking
the EncryptionServiceClient object’s encryptPDFUsingPassword method
and passing the following values:
The encryptPDFUsingPassword method returns
a com.adobe.idp.Document object that contains a
password-encrypted PDF document.
Save the encrypted PDF document as a PDF file.
Create a java.io.File object and ensure
that the file extension is .pdf.
Invoke the com.adobe.idp.Document object’s copyToFile method
to copy the contents of the com.adobe.idp.Document object
to the file. Ensure that you use the com.adobe.idp.Document object
that was returned by the encryptPDFUsingPassword method.
Encrypting a PDF document using the web service APIEncrypt a PDF document with a password by using the Encryption API
(web service):
Include project files.
Create a Microsoft .NET
project that uses MTOM. Ensure that you use the following WSDL definition: http://localhost:8080/soap/services/EncryptionService?WSDL&lc_version=9.0.1.
注意： Replace localhost with the IP
address of the server hosting LiveCycle.
Create an Encryption Client API object.
Create
an EncryptionServiceClient object by using its default
constructor.
Create an EncryptionServiceClient.Endpoint.Address object
by using the System.ServiceModel.EndpointAddress constructor.
Pass a string value that specifies the WSDL to the LiveCycle service (for example, http://localhost:8080/soap/services/EncryptionService?WSDL.)
You do not need to use the lc_version attribute.
This attribute is used when you create a service reference.)
Create a System.ServiceModel.BasicHttpBinding object
by getting the value of the EncryptionServiceClient.Endpoint.Binding field.
Cast the return value to BasicHttpBinding.
Set the System.ServiceModel.BasicHttpBinding object’s MessageEncoding field
to WSMessageEncoding.Mtom. This value ensures that
MTOM is used.
Enable basic HTTP authentication by performing the following tasks:
Assign the LiveCycle user name to the field EncryptionServiceClient.ClientCredentials.UserName.UserName.
Assign the corresponding password value to the field EncryptionServiceClient.ClientCredentials.UserName.Password.
Assign the constant value HttpClientCredentialType.Basic to
the field BasicHttpBindingSecurity.Transport.ClientCredentialType.
Assign the constant value BasicHttpSecurityMode.TransportCredentialOnly to
the field BasicHttpBindingSecurity.Security.Mode.
Get a PDF document to encrypt.
Create a BLOB object
by using its constructor. The BLOB object is used
to store a PDF document that is encrypted with a password.
Create a System.IO.FileStream object by
invoking its constructor and passing a string value that represents the
file location of the PDF document to encrypt and the mode in which
to open the file.
Create a byte array that stores the content of the System.IO.FileStream object.
You can determine the size of the byte array by getting the System.IO.FileStream object’s Length property.
Populate the byte array with stream data by invoking the System.IO.FileStream object’s Read method
and passing the byte array, the starting position, and the stream
length to read.
Populate the BLOB object by assigning the contents
of the byte array to the BLOB object’s MTOM data
member.
Set encryption run-time options.
Create a PasswordEncryptionOptionSpec object
by using its constructor.
Specify the PDF document resources to encrypt by assigning
a PasswordEncryptionOption enumeration value to
the PasswordEncryptionOptionSpec object’s encryptOption data
member. To encrypt the entire PDF, including its metadata and its
attachments, assign PasswordEncryptionOption.ALL to
this data member.
Specify the Acrobat compatibility option by assigning a PasswordEncryptionCompatability enumeration
value to the PasswordEncryptionOptionSpec object’s compatability data
member. For example, assign PasswordEncryptionCompatability.ACRO_7 to
this data member.
Specify the password value that lets a user open the encrypted PDF
document by assigning a string value that represents the open password
to the PasswordEncryptionOptionSpec object’s documentOpenPassword data
member.
Specify the password value that lets a user remove encryption from
the PDF document by assigning a string value that represents the master
password to the PasswordEncryptionOptionSpec object’s permissionPassword data member.
Add the password.
Encrypt the PDF document by invoking
the EncryptionServiceClient object’s encryptPDFUsingPassword method
and passing the following values:
The encryptPDFUsingPassword method returns
a BLOB object that contains a password-encrypted
PDF document.
Save the encrypted PDF document as a PDF file.
Create a System.IO.FileStream object by
invoking its constructor and passing a string value that represents the
file location of the secured PDF document.
Create a byte array that stores the data content of the BLOB object
that was returned by the encryptPDFUsingPassword method.
Populate the byte array by getting the value of the BLOB object’s MTOM data
member.
Create a System.IO.BinaryWriter object by
invoking its constructor and passing the System.IO.FileStream object.
Write the contents of the byte array to a PDF file by invoking
the System.IO.BinaryWriter object’s Write method
and passing the byte array.
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