My take on the post is that it is the worst kind of Daily Mail-esque fear mongering and innuendo. Not only does Bradley lack any evidence for his claim, the evidence he presents completely undermines his argument and distracts attention from what could be a very important point about copyright assignment.

The premise? Mark Shuttleworth has admitted that he plans to follow the open core licensing strategy with Canonical.

The evidence? Mark praises the strategy Trolltech took of selling proprietary licenses.

The problem? Trolltech did not follow the open core licensing strategy. Neither did MySQL, which Bradley suggests inspired Trollech’s strategy.

Both MySQL and Trolltech utilised a dual licensing strategy, which means that the same code base is available under on open source license or a closed source license (also known as “selling exceptions”. This is not open core licensing, although it is related since open core sees vendors dual licensing and offering extensions only available in the closed license version.

A significant difference between dual licensing and open core is that Richard Stallman has explained why, in his opinion, it is okay to sell exceptions to GPL code via a dual licensing strategy. In fact one of the examples he uses is… Trolltech.

So Trolltech is not open core. Or is it? Perhaps it depends on how you define it. Bradley has claimed, at least twice, that there is no agreed definition of open core.

If that were true you could forgive his confusion, but it clearly not. In fact the term open core was delivered fully packaged with a specific definition, courtesy of Andrew Lampitt. As I previously noted, you have to wonder whether many of the people that use the term open core regularly have even read Andrew’s post.

Since Mark’s comments about Trolltech are the only evidence put forward that Canonical is going open core I’m not going to debate that any further.

It is worth considering a couple of other claims Bradley makes, however – such as the idea that Nokia abandoned Trolltech’s business model. It is pretty clear that a company like Nokia has very different motivations and business drivers compared to a company like Trolltech. A strategy that works for Nokia does not mean the strategy that worked for Trolltech was wrong.

However, it is worth noting that in fact Qt business continues to operate the dual licensing strategy. What has happened is that the company has added a new LGPL option and launched a public repository for the software and abandoned the previous requirement for copyright assignment.

This is not a change in business strategy – this is a change in the licensing, development and copyright strategies. Just because Nokia is in a position to open up the development project to encourage more collaborative development (which I agree is a beneficial arrangement for everyone) does not mean that Trolltech’s closed development strategy wasn’t successful.

Undoubtedly Trolltech’s insistence on copyright assignment limited its outside contributions, but copyright assignment does not equal open core, despite Bradley’s insistence that there is “no other plausible & logical conclusion”.

We saw a similar reaction last month in reaction to Diaspora’s copyright assignment policy. However, open core is by no means the only possibility. Dual licensing is another. And as we have seen that comes with RMS’s own seal of approval… except where it results in a version of the code that is only available as closed source (such as open core).

Richard Stallman’s advice on that issue is to “insist that the contribution agreement require that software versions including your contributions be available to the public under a free software license. This will allow the developer to sell exceptions, but prevent it from using your contributions in software that is only available under a proprietary license.”

This is good advice for any developer concerned about open core, and this is the message that gets lost amid Bradley’s anti-open core agenda.

It is absolutely fair to ask why Canonical demands copyright assignment, but to insists that the only reason that they do so is because they are going open core, especially on such flimsy and misleading evidence, is scaremongering and distracts attention from the real issue – which is copyright assignment.

It should be noted, incidentally, that Bradley and Mark have some previous when it comes to copyright assignment, which was also, I believe, caused by confusion rather than malice.

See also this poston the difference between copyright assignment and participation agreements.

*Matt Asay moves from Alfresco to Canonical
*GPL fade fuels heated discussion
*Apple’s iPad and its enterprise and open source impact
*Open source in data warehousing and storage
*Our perspective on Oracle’s plans for Sun open source

iTunes or direct download (32:50, 9.2 MB)