PDF

• (2)PDF Encryption with ps2pdf
  

  PDF Encryption is available with Ghostscript's macros ps2pdf. This
  allows you to restrict the use of the final PDF file.
  
  There are two revisions of the security handler:
  
  - Revision 2: Revision 2 does not work with GS 8.145. It is intended to
  be used with KeyLength equal to 40 bits and produces PDF 1.3 compliant
  documents; that is, intended to be used with Adobe Acrobat 4.0;
  
  - Revision 3: Revision 3 is able to use KeyLength up to 128 bits and
  produces PDF 1.4 compliant documents; that is, intended to be used
  with Adobe Acrobat 5.0.
  
  6.3.1 Common Command Line Parameters
  
  -sOwnerPassword Password allowing full non restrictive access to the
  document. Mandatory to use PDF restrictions.
  
  -sUserPassword Password needed for opening the document. This
  parameter may be left empty.
  
  -dEncryptionR Revision to use. May be either 2 or 3.
  
  -dKeyLength Length of the encryption key. With revision 2, must be
  equal to 40, with revision 3, should be equal to 128.6
  
  -dPermissions Permissions to apply to the document. See description
  below.
  
  
  6.3.2 Revision 2
  
  Document Security can be set with the Permissions flag. For
  EncryptionR=2, subtract these values from -4 to disable an access.
  
  4 = Print document
  8 = Modify contents of document
  16 = Copy text and graphics from document
  32 = Add or modify text annotations
  
  To allow printing and copying, but disable modifying the contents and
  annotations, the value is -4-8-32 so use -dPermissions=-44. To enable
  all, use -dPermissions=-4. To disable all, use -dPermissions=-64.
  
  Command line
  
  ps2pdf13 -sOwnerPassword=OWNER -sUserPassword=USER \
  -dEncryptionR=2 -dKeyLength=40 \
  -dPermissions=PERMISSIONS in.ps out.pdf
  
  6.3.3 Revision 3
  
  See [9, Table 3.15, p. 77] for full details of the user access
  permission values.
  
  4 = Print document (possibly not at the highest quality level,
  depending on whether 2048 is also set)
  8 = Modify contents of document, except as controlled by 32, 256 and
  1024
  16 = Copy text and graphics from document other than that controlled
  by 512
  32 = Add or modify text annotations, fill in interactive form fields,
  and if 256 is set, create or modify interactive form fields
  256 = Fill in existing interactive form fields, even if 32 is clear
  512 = Extract text and graphics (in support of accessibility to
  disabled users or for other purposes)
  1024 = Assemble the document (insert, rotate, or delete pages and
  create bookmarks or thumbnail images), even if 16 is clear
  2048 = Print the document to a representation from which a faithful
  digital copy of the PDF contents could be generated. When this is
  clear (and 4 is set), printing is limited to a low-level
  representation of the appearance, possibly of degraded quality.
  
  To enable all, use -dPermissions=-4. To disable everything apart from
  viewing, combine the following -4 (base) -4 (print) -8 (modify) -16
  (copy) -32 (annotate) -256 (interactive fields) -512 (copy for
  disability access) -1024 (assemble) -2048 (high quality print), so
  -dPermisions=-3904.
  
  Command line :
  
  ps2pdf14 -sOwnerPassword=OWNER -sUserPassword=USER \
  -dEncryptionR=3 -dKeyLength=128 \
  -dPermissions=PERMISSIONS in.ps out.pdf