To use AES 256 encryption for PDF files, obtain and install
the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction
Policy files. These files replace the local_policy.jar and US_export_policy.jar
files in the [Adobe_JAVA_HOME]/jre/lib/security folder. For
example, if you are using Sun JDK 1.6, copy the downloaded files
to the [LiveCycle root]/Java/jdk1.6.0_26/jre/lib/security
folder.
You can download these files from Java SE Downloads.
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