Can I use third part lib in unity script?

Unity Engine
1

I have a csharp lib , for example, including something classes .
How to import it into unity script runtime enviroment and instantiate the classes ?

2

How to use ttf font libs with script ?

3

Can I copy memory content to textures with script ?

4

u need unity pro and read this topic :

Plugins reference

5

I suggest you read that page, because OP does not need pro.

@OP Either drag’n’ drop the classes, or build a DLL and drag and drop that. Google around a bit because this has been covered before.