Forgive me, but I am not sure what the objective is here?
"I am certain that the glass documentation center does not mind if others look into the creation of the glass."
True, but without visiting the same glass documentation centre, and working first hand with the original documents in Spanish and Catalan, in their archives, then research into this topic is a less than rewarding exercise.
"To try to censor people's words is not necessary." I'm not sure where this comes in.
As an author and researcher, I understand completely the points Ivo is trying to make, and he has my utmost respect for his professionalism as a researcher. Few others travel as extensively, visiting glassworks globally, or are aware of the latest developments in museums and archives.
Regards,
Marcus