I think this deserves its own topic.
There is the question of giving a license to an instrument. I was always unsure how to go about this and thus never gave my instruments proper licensing. The problem is that some of the instruments were ports of an early version of netpd that were initially written by someone else without specifying a license. Now, I think I should at least add a license to each instrument I wrote myself and add a comment to the others. Each author should define a license for their instruments. Maybe, the license can be added to the netpd meta tags so that it can be parsed easily. I am happy to hear the opinions of others on the matter.