OT: Adobe Acrobat

On Thu, 19 Apr 2007 15:34:51 -0700, Jim Thompson Gave us:

First, you have to look at the "properties" of the existing PDF document. In order to make changes, changes cannot be locked out. You should be the author of the document as well, at the very least.

Take your super macro digital camera, and take a super macro shot of the signature, and import the super fine, super macro, high resolution jpeg into your super PDF authoring application.

V I O L A!

No need to thank me, as I know you'll use your hard ass attitude to filter me despite that fact that your question was unfalteringly answered. Have a nice life. You should also have digital signatures placed INSIDE the jpeg file, and have it notarized if you intend on using it as a true digital signature, which is not universally recognized in industry or business yet, so further research via an appropriate business law attorney might be in order as well.

On Thu, 19 Apr 2007 16:30:02 -0700, Jim Thompson Gave us:

With PDF authoring, particularly with the actual Adobe authoring tool (acrobat), digital signing is very good, as you LOCK the document with a very large, hard to break, encryption key. You have options as to editable fields, in the case of forms design, OR you can just make it a hard, non-editable work.

Adobe supports this feature since v6 IIRC. If not earlier. My resistor code printout is one example of a document made into a PDF that is non-editable, and signed. If you have my Resistor decoder (I think you complimented me on it), you can look at the properties dialog on the PDF when you bring it up in either the viewer or the authoring tool (acrobat).

On Fri, 20 Apr 2007 20:08:09 -0700, "Paul Hovnanian P.E." Gave us:

Not with Adobe PDFs.

The key is... well... the key. anyone can make it appear as if they have copied your document, or signature, but in a deeper inspection, their key being different than the one you have locked away in your records will make all the difference at a trial.

They have VERY strong encryption.

Try to make my "Resistor Decoder" pdf "editable". I'll bet you cannot. The key is very long, and only I have it.

I can change the author, etc. All kinds of attributes, but the key is what keeps other from doing anything I have not authorized.

On Sat, 21 Apr 2007 23:15:58 -0700, "Paul Hovnanian P.E." Gave us:

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Not even needed. The key the author uses via adobe acrobat is the key that makes the document unique. Anyone can scan or attempt to copy it, but their key will not be the same, and it is easily discovered to be fraudulent.

The features that Acrobat incorporates directly into their own document management schema is all that one needs.

I will post an example of a locked document that is useable in any US court of law. You cannot break it. The key IS the key.

On Sun, 22 Apr 2007 02:41:48 -0400, "Stephen J. Rush" Gave us:

All this nonsense is not required. Adobe incorporates features that makes your document unique to you, and it cannot be broken by anyone.

On Fri, 20 Apr 2007 23:30:43 -0500, snipped-for-privacy@ip-64-139-1-69.sjc.megapath.net (Hal Murray) Gave us:

Another reason to only use what is already incorporated into the authoring tool for the PDF document.

On Fri, 20 Apr 2007 00:02:14 GMT, "Michael A. Terrell" Gave us:

But no fertilizer to fill them with.

On Fri, 20 Apr 2007 00:34:03 GMT, Joerg Gave us:

When will you learn when to breathe, and when NOT to breathe?

Was it diesel or gas?

On Fri, 20 Apr 2007 01:28:49 GMT, Joerg Gave us:

Wrong! There are no "LNG" busses anywhere in the US. Are you crazy!?

They are CNG! Much safer.

A single 50 gallon LNG tank can blow up a quarter of a city block.

Three CNG tanks last several days on the bus, and are far safer.

Black smoke = diesel.

CNG does not emit smoke, unless the engine is so old, the intake valves are sucking oil past the guides.

Take a garbage bag with you. Bag the dog, and hold your breath.

Unless... of course... it is a big dog. :-]

On Fri, 20 Apr 2007 14:13:09 -0400, "Oppie" Gave us:

You are so full of s*it.

On Thu, 19 Apr 2007 18:29:29 -0700, Jim Thompson Gave us:

We made a 20kV filtering device for making old fryer oil usable for another 3 months. That made me think about never eating French fries again.

HV makes the oil particles clomp together such that ordinary filtering media captures it. Turns 3 micron scum particles into ten micron globules. VIOLA! a 5 micron filter and a strong pump are all Mickey D needs to extend the life of his nasty old oil!

On Sat, 21 Apr 2007 08:24:42 +1200, Barry Lennox Gave us:

Wood Chipper?

Hay Bailer?

to

Probably. But mail is only 41c (or 84c international) and amazingly fast :-))

Sorry, I meant CNG. There are LPG propane vehicles though. I have driven one for a while (in the Netherlands).

It's a Rottweiler and a Shepherd mix ;-)

Diesel.

On Sun, 22 Apr 2007 16:37:42 GMT, Joerg Gave us:

Ok... Then just bag his head, and steer clear of the snapping and gnashing teeth!

On Sun, 22 Apr 2007 16:38:24 GMT, Joerg Gave us:

Even though there is visible particulate from a diesel (black smoke), they actually pollute LESS than conventional gas IC engines.

I love the smell, myself.

And no "That must be what is wrong with you" jokes either!

I prefer a content and vendor neutral process for electronic transmittals. Sometimes I'm sending a .dwg or a .tar.gz instead of a .pdf.

You grossly overestimate the capabilities of commercial companies doing cryptographic analysis. You might have known better if you had reasonably looked at the frequent failures from both cryptographic failures and human failures.