If fonts are installed after the font cache was generated by PDFreactor, please delete the fontcache file before running PDFreactor again to ensure they are included in the cache. See below for more information about the font cache mechanism.
Under Windows the required fonts should usually be installed by default.
In order to use your own additional fonts, just copy the ttf files into the windows\fonts directory.
Under Linux, you must download the msttfcorefonts package (or the single fonts) from http://corefonts.sourceforge.net/.
Then unpack the fonts and move them into the $JAVA_HOME/jre/lib/fonts directory.
Thus, the fonts are automatically registered by the JRE as well as PDFreactor.
On Mac OS X the required fonts are already installed and registered by the Java VM, but they're in a format which cannot be read by PDFreactor. Therefore, it is necessary to convert those fonts before registering.
The PDFreactor GUI provides the possibiltiy to launch the font converter "Fondu", which creates the according true type fonts from the native dfont files. If you installed PDFreactor using the installer package, Fondu is automatically, launched during the installation (on Mac OS only).
Fondu stores the converted ttf files in folder user.home/.PDFreactor/fonts.