Guymon » pdf

Spaß mit PDF-Dateien

admin — Thu, 08 Sep 2011 13:00:23 +0000

(Apples Vorschau, aber auch Adobes Acrobat) kopiert in PDF-Dateien nicht nur eine mit dem Auswahlwerkzeug markierte Passage, sondern übernimmt auch den vollständigen Inhalt der restlichen Seite – versteckt und unbemerkt – in ein neu aus der Zwischenablage angelegtes Dokument. Der ausgeblendete Teil bleibt auch über das anschließende Speichern und weitere Bearbeiten der neuen PDF-Datei vorhanden.

Das scheint eher ein technisches Problem zu sein, als ein Bug. Ist aber in jedem Fall spannend zu wissen.
via heise

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Rendering PDF with HTML5 and JavaScript

admin — Fri, 24 Jun 2011 14:03:30 +0000

Wow, beeindruckend – Rendering PDF with HTML5 and JavaScript.

We have been developing pdf.js in the open, albeit quietly, for about a month now. We were waiting on the completion of some major features (Type1 fonts, gradients, etc.) before communicating pdf.js more broadly. We’ve been taken by surprise by the early and intense interest in our work, so we decided to blog and talk about our project earlier than we initially planned. (…) If you want to see a demo of pdf.js, click on this link. There are still glitches and rendering artifacts, but you will get the picture. We are still missing Type1 PostScript fonts, which Vivien Nicolas is working on.

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admin — Wed, 09 Mar 2011 09:53:00 +0000

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PDF Probleme

admin — Fri, 31 Dec 2010 12:54:49 +0000

Julia Wolf zeigte auf dem 27C3 zahlreiche Sicherheitsprobleme des PDF Formats.

Beispielsweise könne man in ein PDF einen Datenbank-Scanner einbauen, der beim Ausdrucken des Dokuments auf einem Netzwerkdrucker aktiv werde und das Netzwerk abtaste. Auch sonst sei das Dokumentenformat für zahlreiche Überraschungen gut. Es sei etwa möglich, PDFs zu schreiben, die in unterschiedlichen Betriebssystemen, Browsern oder PDF-Lesern – oder sogar in Abhängigkeit von der Spracheinstellung eines Rechners – verschiedene Inhalte darstellten.

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admin — Tue, 07 Dec 2010 19:50:28 +0000

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admin — Mon, 20 Sep 2010 12:39:16 +0000

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HTML to PDF

admin — Wed, 28 Apr 2010 11:56:06 +0000

pdfcrowd klingt spannend, denn man braucht ja häufiger mal eine Webseite als PDF Download, also testen.

Create PDF from a web page or an uploaded HTML document.
Control PDF options including page dimensions, margins, encryption, permissions, initial view, etc.
You can upload an HTML document packed together with external images and Stylesheets.
No third party libraries needed.
The API is available virtually on any platform that supports HTTP.
When security is a concern, the API can be called over HTTPS.

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admin — Wed, 03 Mar 2010 08:20:59 +0000

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Hiding Files in PDF Documents

admin — Sat, 25 Jul 2009 15:38:47 +0000

Netter Trick: Embedding and Hiding Files in PDF Documents.

Das Python Script gibt es hier. Und nein, das ist keine sichere Methode um Daten zu verstecken, aber eben ein netter kleiner Trick.

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Digitale Filzstifte

admin — Mon, 27 Apr 2009 07:10:22 +0000

Im Sicherheitsblog gibt es einen Text über die Fallstricke digital geschwärzter Dokumente:

“Druckt” man nämlich z.B. schwarzen Text auf schwarzem Grund in eine PDF-Datei, so enthält letztere genau das, was man vorher auch hatte: schwarzen Text auf schwarzem Grund. Ein kurzer Umweg über die Zwischenablage reicht hier schon aus, um den Text sichtbar zu machen. Gleiches gilt für schwarze Rechtecke über dem Text.

Die Idee, ein PDF sei eine Art Foto dessen, was man auf einem Ausdruck sehen würde, ist weit verbreitet (besonders bei der “muss-ich-drucken-weil-will-ich-lesen”-Fraktion). Leider ist dies nicht so. Selbst die Umwandlung in eine Grafik hat seine Tücken. Beherrscht das Grafikformat Layer, so bleibt der Originaltext u.U. ebenfalls erhalten.