More fun with Title 17 USC

[Anthony DeRobertis <asd@suespammers.org>]

 (Sec. 101):
	''joint work'' is a work prepared by two or more authors
	with the intention that their contributions be merged
	into inseparable or interdependent parts of a unitary whole.

(Sec. 201(a)):
	Copyright in a work protected under this title vests initially
	in the author or authors of the work.  The authors of a joint
	work are coowners of copyright in the work.

See also:
	<http://biz.findlaw.com/intellectual_property/nolo/faq/BABFA71E-97C9- 
479F-8A9D4C3DB2498663.html#A19C3BE3-4459-4340-B8817F3B75D22ECD>
	<http://profs.lp.findlaw.com/copyown/copyown_3.html>
	<http://library.lp.findlaw.com/articles/file/00102/004454/title/ 
Subject/topic/Intellectual%20Property%20Law_Copyright/filename/ 
intellectualpropertylaw_1_233>
	<http://www.utsystem.edu/ogc/intellectualproperty/cybrscen.htm>
	<http://cyber.law.harvard.edu/metaschool/fisher/joint/links/cases/ 
childress.html>
	<http://cyber.law.harvard.edu/metaschool/fisher/joint/links/cases/ 
erickson.html>

So, I wonder, how many open-source works qualify as joint works? There  
would certainly be some benefits (e.g., making clear who can sue for  
copyright infringement --- any of the authors) but some serious  
downsides too (like any of the authors being able to grant  
non-exclusive licenses, without the other authors' consent).