In order to get rid of the watermark of Bandicam, you need to record with the full version of Bandicam.
I'm sorry, but I do not have any money. I don't have a credit and gift card to buy one. I don't know why Bandicam was made; and all the Bandisoft products are still nagware today. If so, do not waste your time replying this. This is a program for taking pictures and recording videos.
Once you purchase the program, there is a lifetime guarantee on the license as long as you follow the license policy.
I'm definitely disappointed of why the software developers of Bandisoft made it. Also, it always doesn't matter if people buy the full version, or just get stuck on a trial period. (Sorry for the bump.)