This is true with Qt, MySQL, and others. These projects are completely free to use as long as you do NOT link any proprietary code with it, but the minute you want to use the product, but do not want to disclose your code, you pay. In this model, individuals and other companies are not as motivated to contribute, as someone else makes the profits.
Actually, I think that MySQL should release all of the libraries under LGPL instead of GPL, and focus in on giving the best support, rather than using license tricks to get people to sign up for a license. If PostgreSQL gains much traction against them, they might be forced to do that sooner rather than later. Actually, with Sun behind MySQL, they might be more inclined to do that.
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