4 Replies Latest reply on Apr 12, 2011 2:49 AM by ArneAtAdobe

    How can I encrypt reader extended documents?

    ArneAtAdobe Level 1

      Hi,

      I use the Java API of the livecycle ES to encrypt a dynamic, reader extended PDF. I get the error message:

       

      ALC-ENC-100-015 Can not encrypt reader extended document.

       

      My use case is the following:

      A document is sent to some users. It is encrypted with a certificate. The users enter data into the document, encrypt it again and send it back via email. The document is never sent unencrypted. A server receives the email, extracts the document and reads the data the user entered.

       

      How can I implement this use case when I cannot encrypt reader extended documents?

       

      Thanks in advance for your answer.

      Regards,

      Arne

        • 1. Re: How can I encrypt reader extended documents?
          SForrest96 Level 4

          The order of operations is always Encrypt (first), Reader Extend (second), (and if you are also certifying the document) Certify (third) (when you certify a document, an "Author" digital signature is applied to the document).

           

          There is no way around this, the document must be encrypted first, then RE applied.

           

          Regards

          Steve

          • 2. Re: How can I encrypt reader extended documents?
            ArneAtAdobe Level 1

            oh, I can add RE to an encrypted document? that is good to know. Plus I did not realize that I can add RE with the Java API.

             

            Thank you very much for your answer, this helped a lot.

            • 3. Re: How can I encrypt reader extended documents?
              ArneAtAdobe Level 1

              Hi,

              I implemented encryption and reader extension and I get the following error when I add reader extensions to my formerly encrypted document:

               

              Caused by: com.adobe.livecycle.readerextensions.client.ProcessingException: ALC-RES-001-022: The input PDF document is encrypted and needs to be unlocked for this operation.

               

               

              When I do it the other way round, I get the error message I described above. So, how can I encrypt and reader extend my document?

               

              There is a thread here but it does not solve my problem.

               

              Thanks in advance for your help.

               

              Cheers,

              Arne

              • 4. Re: How can I encrypt reader extended documents?
                ArneAtAdobe Level 1

                Problem solved, you have to unlock the pdf before adding reader extensions.

                 

                There is a difference between unlocking and removing encryption. When you unlock a pdf you just open it up for some operations. After that (precisely: when you call the getInputStream() method) it will be locked (encrypted) again.

                 

                When you add encryption to a document, it is added when you persist the doc somehow. From the document's point of view persisting means calling the getInputStream() method. That method is used when you copy the document to a file. This means that you can encrypt a document and add reader extension right after that without unlocking the pdf. When you save it afterwards the encryption wil be applied.

                 

                When you encrypt a document, save it and then add RE, you have to unlock it first, because the encryption is already applied.

                 

                I hope this helps someone to save the time I needed to figure that out.

                 

                Happy encrypting,

                Arne