Thanks, and sorry for duplicating questions, and not searching first.
I just wanted to say that I used to download source code because I like literature, good books, fascinating novels... And PDN source code can be read exactly as a good book: suspense (how did he manage to do this...? goto definition...), style, hidden gems in some paragraphs, overall construction...
If anybody knows Scott Hanselman's computer zen blog, then she knows this man writes regularly a series of posts named "The weekly source code" under labeled an "ongoing quest to read source code to be a better developer". This is exactly what I have in mind when I grab PDN source code.
About people stealing code, unless Rick obfuscates PDN, there will be nothing preventing people from reflectoring his code (at least the managed parts)... This will certainly be less readable, but I don't think such people care about style and beauty...
So, I'll end with a great thanks to Rick for having provided us during such a long time with such material to read (and I'll go right now backuping my latest source download).
PS: by the way, Scott has had a discussion with Rick available here: Hanselminutes Podcast 138 - Paint.NET with Rick Brewster.