Re: PDF Questions

Re: PDF Questions

[Karsten Tinnefeld]

> This is a funny one. The java code clearly says: 
> 
>  public RC4()
> 
> Looks pretty public to me, especially for non java experts -)

Simply means that every method may access the class, create variables 
of its type, call its functions, etc.

Without any reply, I asked pdftex-l on February 17th,
--8<--
Has anyone yet startet a project to implement the 
pdf standard encryption mechanism with pdfTeX?

Ideally, there would be a 
	\pdfpermissions {/printing  (enabled)
			 /copying   (disabled)
			 /ownerpass (thelionsleepstonight) }
field setting permission flags, owner and user password, if any,
maybe being entered/input separately.

As ianal I cannot determine whether or not usage of the (fake) rc4/md5 
algorithms would be a serious problem nowadays, but this (and the 
demand for a encrypted-only pw storage) may be a reason for a partially 
separate tool.

Comments?
--8<--

I still think that whether or not encryption is to be done in a 
separate pass, information about this should be kept in the tex file.

Karsten
-- 
Karsten Tinnefeld                       tinnefeld@ls2.cs.uni-dortmund.de
Fachbereich Informatik, Lehrstuhl 2                   T +49 231 755-4737
Universität Dortmund, D-44221 Dortmund, Deutschland   F +49 231 755-2047

Re: PDF Questions

[Hans Hagen]

At 03:05 PM 3/28/2000 +0200, you wrote:
>> This is a funny one. The java code clearly says: 
>> 
>>  public RC4()
>> 
>> Looks pretty public to me, especially for non java experts -)
>
>Simply means that every method may access the class, create variables 
>of its type, call its functions, etc.

I know since NTS is prototyped in Java -) I just considered it a funny
contraditionary. They could have made it a private class.

>Without any reply, I asked pdftex-l on February 17th,
>--8<--
>Has anyone yet startet a project to implement the 
>pdf standard encryption mechanism with pdfTeX?
>
>Ideally, there would be a 
>	\pdfpermissions {/printing  (enabled)
>			 /copying   (disabled)
>			 /ownerpass (thelionsleepstonight) }

This would not work, since there are no such keys. Also, it would have to
be real primitives, since pdftex does not interpret what goes into objects
and attr's. 

>field setting permission flags, owner and user password, if any,
>maybe being entered/input separately.

actually it's an object 

  /Filter /Standard /V 1 /R 2 /O

to which the Encrypt key points

  trailer<</Size 26/Info 8 0 R /Encrypt 11 0 R

so \pdftrailerattr would be more appropriate. 

>I still think that whether or not encryption is to be done in a 
>separate pass, information about this should be kept in the tex file.

Sure, that will not be the problem. Since that can be passed on. 

Hans

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OT - NTS implementation language

[Ed L Cashin]

Hans Hagen <pragma@wxs.nl> writes:

> I know since NTS is prototyped in Java -) 

I thought that it was going to be written in Java and stay Java.  Are
you saying that while it's prototyped in Java, the production version
may be in something like C++ or Objective-C? 

-- 
--Ed Cashin                     PGP public key:
  ecashin@coe.uga.edu           http://www.coe.uga.edu/~ecashin/pgp/