PDFreactor doesn't necessarily need to be run with a license key. When no license key is found, PDFreactor runs in evaluation mode. In this mode, several pages containing information about PDFreactor are inserted randomly into the resulting PDF document.

After purchasing a PDFreactor license, RealObjects provides you a license key file in XML format. The license key can be set as a string using the setLicenseKey method of the PDFreactor class.

Example:

String licensekey = "<license>... your license ...</license>";
pdfReactor.setLicenseKey(licensekey);