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TABLE 314 Additional encryption dictionary entries for the standard security handler
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KEY TYPE VALUE
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(Required) A number specifying which revision of the standard security handler should be used to interpret this dictionary The revision number should be 2 if the document is encrypted with a V value less than 2 (see Table 313) and does not have any of the access permissions set (via the P entry, below) that are designated Revision 3 in Table 315; otherwise (that is, if the document is encrypted with a V value greater than 2 or has any Revision 3 access permissions set), this value should be 3 (Required) A 32-byte string, based on both the owner and user passwords, that is used in computing the encryption key and in determining whether a valid owner password was entered For more information, see Encryption Key Algorithm on page 78 and Password Algorithms on page 79 (Required) A 32-byte string, based on the user password, that is used in determining whether to prompt the user for a password and, if so, whether a valid user or owner password was entered For more information, see Password Algorithms on page 79 (Required) A set of ags specifying which operations are permitted when the document is opened with user access (see Table 315)
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The values of the O and U entries in this dictionary are used to determine whether a password entered when the document is opened is the correct owner password, user password, or neither The value of the P entry is an unsigned 32-bit integer containing a set of ags specifying which access permissions should be granted when the document is opened with user access Table 315 shows the meanings of these ags Bit positions within the ag word are numbered from 1 (low-order) to 32 (high-order); a 1 bit in any position enables the corresponding access permission Which bits are meaningful, and in some cases how they are interpreted, depends on the security handler s revision number (speci ed in the encryption dictionary s R entry) Note: PDF integer objects in fact are represented internally in signed twoscomplement form Since all the reserved high-order ag bits in the encryption dictionary s P value are required to be 1, the value must be speci ed as a negative integer For example, assuming revision 2 of the security handler, the value -44 allows printing and copying but disallows modifying the contents and annotations
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TABLE 315 User access permissions
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BIT POSITION MEANING
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Reserved; must be 0 (Revision 2) Print the document (Revision 3) Print the document (possibly not at the highest quality level, depending on whether bit 12 is also set) Modify the contents of the document by operations other than those controlled by bits 6, 9, and 11 (Revision 2) Copy or otherwise extract text and graphics from the document, including extracting text and graphics (in support of accessibility to disabled users or for other purposes) (Revision 3) Copy or otherwise extract text and graphics from the document by operations other than that controlled by bit 10 Add or modify text annotations, ll in interactive form elds, and, if bit 4 is also set, create or modify interactive form elds (including signature elds) Reserved; must be 1 (Revision 3 only) Fill in existing interactive form elds (including signature elds), even if bit 6 is clear (Revision 3 only) Extract text and graphics (in support of accessibility to disabled users or for other purposes) (Revision 3 only) Assemble the document (insert, rotate, or delete pages and create bookmarks or thumbnail images), even if bit 4 is clear (Revision 3 only) Print the document to a representation from which a faithful digital copy of the PDF content could be generated When this bit is clear (and bit 3 is set), printing is limited to a lowlevel representation of the appearance, possibly of degraded quality (See implementation note 16 in Appendix H) (Revision 3 only) Reserved; must be 1
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