tent of the document creator by restricting user access to an encrypted PDF file according to
the permissions contained in the file.
7.2.2 PDFlib                 
           
                 
PDF_begin_document( )   
userpassword    masterpassword   
                                                                                                     
                          
>                                                                                                
                                                                                            
                                                                     
>                                                                                                                                        
                                                                                          
                                                       
>                                                                                                   
                                                                                      
                                         
                                                                                          
                
ASCII     
                                                            
                                                                                          
                      
A                                                                         
                                                                                                
                                 
A                                                                     
                                                                                               
                                                                          
space                 
                                                                                        
                                                                                        
                                   
A                                   
A                                  
                                                                                                      
                                                                                                
                                                                                                  
                                             
>                                                                                 
                                         
>                                                                                 
                
>                                                                                            
                                                                                              
      
                                                                                                
                                                                                                
                                                                                            
                                                                                          
    
          
PDF_begin_document( )   
permissions                                      
                                                                     
permissions     
                          
masterpassword                                                    
188
  
7   
:                    
PDF       






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