The watermark you are referring to, is supposedly the copyright name of the creator of the module. In this case the most recommended would be to make your own one. Although the device has been built by the manufacturer with a certain microcontroller (eg AVR), if you feel more comfortable working with another core (ex.PIC), nothing prevents you from modeling the macro operation of this module by programming with a Firmware from another manufacturer. What matters for Proteus simulator in this modeling is the overall behavior of the device, regardless of how its internal programming was been implemented.