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Was ist Okular?

Okular is a universal document viewer developed by KDE. Okular works on multiple platforms, including but not limited to Linux, Windows, Mac OS X, *BSD, etc.

Sie können die Entwicklung des Projekts auf der Homepage verfolgen.

Hintergrund

Die Entwicklung begann als Teil von Google's Summer of Code Programm. Die Beschreibung des Projekts ist auf der KDE Developer's Corner verfügbar.

Okular combines the excellent functionalities of KPDF with the versatility of supporting different kinds of documents, like PDF, Postscript, DjVu, CHM, and others.

Die Übersicht der unterstützten Formate enthält eine Tabelle die im Detail die unterstützen Formate und deren Funktionen darstellt.

Rezensionen in Okular; Rezensionen können innerhalb der PDF Datei mit abgespeichet werden.

Neben der Unterstützung vieler Formate, bietet Okular Funktionen wie Text-Auswahl, Kommentierung, Extraktion von Dateien die in einem Dokument eingebettet sind und viele andere Überraschungen. Bildschirmfotos von Okular in Aktion können Sie hier sehen.

Sie können zu Entwicklern und anderen Anwendern im IRC sprechen, irc.freenode.org, Kanal #okular.

Wenn Sie daran interessiert sind einen Beitrag zu Okular zu leisten, kontaktieren Sie bitte das Team. Programmierer, aber auch die, die nicht kodieren sind willkommen.

Mobile Version

Okular has a mobile version since version 0.16 release in February 2013 ^[1]. The first version was based on the active framework. The mobile viewer was then ported to Kirigami in 2016 by Marco Martin^[2] and finally to Kirigami2 in 2017^[3].

The mobile version doesn't support all features from the desktop version, but provide better touch support and a mobile interface.

You can test the mobile version in your PC by entering

okularkirigami

in your terminal.

Tipps und Tricks

Rezension

Ein Doppelklick auf eines der Rezensions Werkzeuge (F6) erlaubt es ihnen mehrere Anmerkungen durchzuführen, ohne das Sie nach der ersten Benutzung das Werkzeug wieder aktivieren müssen.

How to keep the annotations you made to the PDF file:

By default, Okular saves annotations in the local data directory for each user. Since KDE 4.9, it's optionally possible to store them directly in a PDF file by choosing File -> Save As..., so they can be seen in other PDF viewers. Note that this feature requires Poppler 0.20 or newer for regular PDF documents. If the PDF document you are annotating is encrypted, this feature requires Poppler 0.22 or newer.

DRM

By default, Okular follow the PDF specification and don't allow copying text from DRM protected files. However, there is an option in the settings to disable DRM limitations in Settings -> General -> Program Features -> Obey DRM limitations

There was a small controversy in the Debian bug tracker a long time ago, about the default choice to Obey DRM limitations^[4]^[5]. The choice was then explained by an Okular/KPdf developer^[6].

PDF Signature and certificate

Okular can verify if a PDF certificate is valid. But you can not yet create a new signature. See release note for more information.

More Information

References

[1] Release information

[2] Commit port mobile version from plasma-framework to kirigami

[3] Commit port mobile version from kirigami to kirigami2

[4] DRM and Okular in Debian bug tracker

[5] DRM and Okular in LWM

[6] Okular, PDF and file permissions

[1]

[2]

[3]

[4]

[5]

[6]

@@ Line 24: / Line 24: @@
 == Mobile Version ==
-Okular has a mobile version since version 0.16 release in February 2013 <ref>[https://okular.kde.org/news.php Release information]</ref>. The first version was based on the [https://community.kde.org/Plasma/Active active] framework. The mobile viewer was then ported to Kirigami in 2016 by Marco Martin<ref>[https://phabricator.kde.org/R223:eb1f73800e83b11e4a5ae93ac069893aa88f0eaa|Commit port mobile version from plasma-framework to kirigami]</ref> and finally to Kirigami2 in 2017<ref>[https://phabricator.kde.org/R223:caf8820cf773316ce41d9a8c1f7357b3ffc3ef86|Commit port mobile version from kirigami to kirigami2]</ref>.
+Okular has a mobile version since version 0.16 release in February 2013 <ref>[https://okular.kde.org/news.php Release information]</ref>. The first version was based on the [https://community.kde.org/Plasma/Active active] framework. The mobile viewer was then ported to Kirigami in 2016 by Marco Martin<ref>[https://phabricator.kde.org/R223:eb1f73800e83b11e4a5ae93ac069893aa88f0eaa Commit port mobile version from plasma-framework to kirigami]</ref> and finally to Kirigami2 in 2017<ref>[https://phabricator.kde.org/R223:caf8820cf773316ce41d9a8c1f7357b3ffc3ef86 Commit port mobile version from kirigami to kirigami2]</ref>.
-The mobile version doesn't support all features form desktop version, but provide better touch support and a mobile interface.
+The mobile version doesn't support all features from the desktop version, but provide better touch support and a mobile interface.
 [[File:Okular_mobile_pdf_view.png|250px]]
@@ Line 49: / Line 49: @@
 By default, Okular follow the PDF specification and don't allow copying text from DRM protected files. However, there is an option in the settings to disable DRM limitations in <menuchoice>Settings -> General -> Program Features  -> Obey DRM limitations</menuchoice>
-There was a small controversy in the Debian bug tracker a long time ago, about the default choice to Obey DRM limitations<ref>[https://lists.debian.org/debian-devel/2009/05/msg00879.html DRM and Okular in Debian bug tracker]</ref><ref>[https://lwn.net/Articles/335415/ DRM and Okular in LWM]</ref>. This was then [https://tsdgeos.blogspot.com/2009/06/okular-pdf-and-drm.html justified] by a Okular/KPdf developer<ref>[https://tsdgeos.blogspot.com/2009/06/okular-pdf-and-drm.html Okular, PDF and file permissions]</ref>.
+There was a small controversy in the Debian bug tracker a long time ago, about the default choice to Obey DRM limitations<ref>[https://lists.debian.org/debian-devel/2009/05/msg00879.html DRM and Okular in Debian bug tracker]</ref><ref>[https://lwn.net/Articles/335415/ DRM and Okular in LWM]</ref>. The choice was then [https://tsdgeos.blogspot.com/2009/06/okular-pdf-and-drm.html explained] by an Okular/KPdf developer<ref>[https://tsdgeos.blogspot.com/2009/06/okular-pdf-and-drm.html Okular, PDF and file permissions]</ref>.
 === PDF Signature and certificate ===
-Okular can verify if a PDF certificate is valid. But you can not yet create new signature. See [https://tsdgeos.blogspot.com/2019/01/okular-pdf-signature-certificate.html release note] for more information.
+Okular can verify if a PDF certificate is valid. But you can not yet create a new signature. See [https://tsdgeos.blogspot.com/2019/01/okular-pdf-signature-certificate.html release note] for more information.
 == More Information ==