I have a definite answer. While NIS+ is no longer supported, it is still owned by Sun Microsystems and is not open source. My source is : Siever, E (2005) [u]Linux in a Nutshell.[/u] 5th ed. California: O‚ÄôReilly & Associates, Inc., pp 29.
A package can be open sourced, but still "owned" by a company like Sun/Oracle. The license is the issue. IE, I can write software, release it to the FOSS community with a GPL or other license (BSD, Apache, et al), yet still maintain ownership of the code. Because I own the copyright, I can modify it for other purposes without placing the new code into the public domain. So, ownership != openness.