I have found a way to implement "markers" now.
Get mingw, and write a function c and use your markers there related to the documentation of your protector and call this function from within your blitzmax program.
Its not a very fine solution but it works.
Now I call a C function that does some basic calculations for whatever and this function is encrypted.
See also BlitzMax Docu "Advanced topics" how to call c functions from within BlitzMax.
Get mingw, and write a function c and use your markers there related to the documentation of your protector and call this function from within your blitzmax program.
Its not a very fine solution but it works.
Now I call a C function that does some basic calculations for whatever and this function is encrypted.
See also BlitzMax Docu "Advanced topics" how to call c functions from within BlitzMax.