I've analyzed the program's description and features and didn't find anything about the L-Shape Advertisement you mention in your inquiry. CINESoft MOVIE PLAYER features a couple of tools to add logos and various graphical elements, but that's it. No one mentions the L-Shape graphics feature. However, I've seen this in another application, and besides the usual features, the L-Shape tool was easy to use.
The name of the app is AdMaxOne and you can obtain additional information from its official website.