A lot has been written for and against open core now. Yet in the end, a couple tweets can catch all that is needed:

scurryn @h_ingo -- So as long as 'an open core vendor' doesn't call themselves 'an open source vendor' then everything's fine?

h_ingo @scurryn: pretty much. I think I owe everyone one more blog post to answer that question with a few more details.

(Twitter)

This is that blog post.

Oh my. I was outside painting my house for a few days, and when I return back online I discover that now everyone is having an opinion on the open core business model. Since some participants are still trying to promote it as a valid open source business model, let's see what everyone is saying and highlight any pitfalls being offered...

Glyn Moody has an interesting piece on Why Patents are Like Black Holes where he looks at the situation when a large patent holder goes bankrupt - or is about to. His point is that even if a company otherwise can go out of business cleanly, the patents often remain as a piece of "IPR" that can come back and haunt us like a zombie.

Also Matt Asay recently weighed in on the subject:

Update: Before posting this, I had made an effort to verify that this was not a technical problem. However, Lenz from the MySQL Community team has now replied that indeed Zak Greant's RSS feed had changed it's URL address (see comments), which is why new posts did not appear. So rather than telling anything about Planet MySQL, this post is good evidence of my and others mistrust towards it - thankfully still unfounded. (The roots of this is also discussed in the comments.)

NOTE: Heading of this post was subsequently changed.

Not that I would be surprised of anything anymore, but still.

This blog post was originally posted on November 10, 2008. It was then withdrawn the next day and replaced with the short explanation below. Since the person who asked me to withdraw it has since left Sun, I have left Sun, and Sun itself will not exist anymore in a few days, I have decided to re-publish the original text for historical purposes.