Viewer license allows displaying PDF document in Viewer component without any limitations.
Also, it allows printing loaded document directly from Viewer component.
Viewer license doesn't support silent printing.
Print license allows to print or convert PDF document silently without any limitation.
If the Viewer component displays the document, it will show demo sign.
If the Viewer component prints the document, then it will print it without demo sign.
Full license allows to print, convert and display PDF document without any demo limitation.