There are no rules regarding the use of DLLs. I have never used them, so please bear with me if I am technically off-centre.
Can they be used?
Can 3rd party DLLs be used?
How about standard Windows DLLs?
Should there be a rule regarding ownership should a 3rd party DLL written by a DB coder be used?
I realise there is a rule regarding ownership and use of media, but libraries aren't media.
I realise there is a rule regarding installation routines, but if a DLL requires installation (don't know, never used them), I'm sure it could easily be done covertly as a startup check.