Adobe 12020596 User Guide - Page 17
The value of, is 4 or less, The value for, TABLE 3.19 Additional encryption dictionary entries
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Adobe Acrobat SDK Adobe® Supplement to the ISO 32000 Syntax (Chapter 3 in PDF Reference) 3.5.2 Standard Security Handler 17 TABLE 3.19 Additional encryption dictionary entries for the standard security handler KEY TYPE VALUE O string (Required) A string used in computing the encryption key. The value of the string depends on the value of the revision number, the R entry described above. The value of R is 4 or less: 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. The value for R is 5: (ExtensionLevel 3) A 48-byte string, based on 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 124 and "Password Algorithms" on page 126. U string (Required) A string based on the user password. The value of the string depends on the value of the revision number, the R entry described above. The value of R is 4 or less: 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. The value for R is 5: (ExtensionLevel 3) A 48-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 password was entered. For more information, see "Password Algorithms" on page 126. OE string (ExtensionLevel 3; required if R is 5) A 32-byte string, based on the owner and user passwords, that is used in computing the encryption key. For more information, see "Password Algorithms" on page 126. UE string (ExtensionLevel 3; required if R is 5) A 32-byte string, based on the user password, that is used in computing the encryption key. For more information, see "Password Algorithms" on page 126. P integer (Required) A set of flags specifying which operations are permitted when the document is opened with user access (see Table 3.20).