The Standard license is used to process video streams. It detects faces, face landmarks, recognizes age and gender and sends the results to a remote server or stores them in a local directory. Read the Developer's Guide and test using a trial license at http://www.eyedea.cz/downloads/ .
The Expert license is primarily used to process image databases. The Expert API contains the whole interface of Standard API and adds advanced functionality for a higher level of control over the processing. Please see the Developer's guide, chapter 6.1., for more details.