Developing for Documentum

Yesterday, I was poking around Documentum website to see what is involved in developing software for Documentum.  There was almost nothing to download other than some fluffy whitepapers.  Unless I am mistaken, one must become a Documentum Partner to develop anything that works with Documentum.  What does it take to become a Documentum Partner?  $10K per year.  Ouch.  Documentum is an exclusive club of sort.  A competitor smart enough to leverage the open source community should be able to run circles around Documentum.