Using Radaee Pdf source before licensing

Hi
I downloaded the radaee pdf source code and added it to my android application. I haven't purchased any licenses yet because, I am hoping to buy it later after testing out the pdf library in my application. But when I run it on my android tablet the pdf viwer's some tools are not showing, such as annotation tools , selection tools, undo and redo tools. But when I compiled the source code of the downloaded library code , it works fine. It only shows limited tools in my application. Do i have to buy a license to enable all the tools and features.
Please answer me!!

Hi,
you can test different license types before buying the license by following this article : www.radaeepdf.com/support/knowledge-base...=component&kbartid=4