diff -up calibre/src/calibre/linux.py.orig calibre/src/calibre/linux.py
--- calibre/src/calibre/linux.py.orig	2014-08-01 19:18:33.227016144 +0200
+++ calibre/src/calibre/linux.py	2014-08-01 19:21:42.575143513 +0200
@@ -934,6 +934,7 @@ Comment=Viewer for LRF files (SONY ebook
 TryExec=lrfviewer
 Exec=lrfviewer %f
 Icon=calibre-viewer
+NoDisplay=true
 MimeType=application/x-sony-bbeb;
 Categories=Graphics;Viewer;
 '''
@@ -948,6 +949,7 @@ Comment=Viewer for E-books in all the ma
 TryExec=ebook-viewer
 Exec=ebook-viewer --detach %f
 Icon=calibre-viewer
+NoDisplay=true
 Categories=Graphics;Viewer;
 '''
 
@@ -961,6 +963,7 @@ Comment=Edit e-books in various formats
 TryExec=ebook-edit
 Exec=ebook-edit --detach %f
 Icon=calibre-ebook-edit
+NoDisplay=true
 Categories=Office;
 '''