komsomolze wrote:Ich habe noch nie Acrobat Reader unter linux benutzt, nur xpdf.
Ich denke aber nicht, daß das alle pdf-Versionen darstellen kann,
Denke ich auch nicht. Allerdings kann der Acroread das auch nicht. Ich habe hier einen Haufen Datenblätter mit chinesischen Zeichen, die den Acroread dazu veranlassen, *gar kein* Zeichen mehr anzuzeigen, während xpdf die "schwierigen" Fälle einfach ignoriert.
oder deren Formulare ausfüllen.
Das dürfte weniger als 1/10000 aller PDFs betreffen, die man jemals öffnet. Kann man denke ich auch drauf verzichten.
Und die Zusatzfunktionen gibt es beim xpdf auch nicht.
Stimmt, immerhin! Ich brauche z.B. keinen Webbrowser, wenn ich nur eine Druckvorschau haben will.
Aber das macht es zumindest:
The Xpdf package honors these permission settings. Specifically:
* xpdf will not copy/paste from a PDF file which disallows copying text/graphics
* xpdf and pdftops will not print (convert to PostScript) a PDF file which disallows printing
* pdftotext will not convert a PDF file which disallows copying text/graphics
* pdfimages will not extract images from a PDF file which disallows copying text/graphics
Und wer das ignorieren, will, kann es tun, denn xpdf ist freie Software!
I distribute source code (for Xpdf) under a particular license (the GPL) which depends entirely on users' goodwill for its effectiveness. If any of my users ever decided to violate the license, I would probably never even know about it, much less be able to do anything about it. The only thing I can do is trust the users.
In light of this, it would be very hypocritical of me to, on one hand, ask people to honor my licensing restrictions, and, on the other hand, bypass (or assist others in bypassing) another author's requested restrictions.
In addition to all of this, Adobe requires that implementors of the PDF spec adhere to the document permissions.
"But copyright law allows me to quote parts of a document under the fair use provisions -- and Xpdf is preventing me from doing that." Not really: you're still free to quote the document the same way you would a newspaper article, i.e., by retyping the text. If I have to choose between honoring the author's request and trying to interpret the law (exactly how much does fair use allow you to extract? should Xpdf allow copying a certain amount of text out of protected documents?), I'll choose to honor the author's request, no matter how misguided. For those who would argue that important content might get irretrievably locked away in PDF format, I'll remind you that Xpdf is open source, and can be modified by end users (the GPL even allows this).
Hier hat das auch mal jemand exemplarisch gemacht:
http://www.johannes-bauer.com/xpdf/xpdf.php
Janka