“At No Charge”

There are three words in the GPL's reciprocity provision that I saved until now. Here's how the GPL reads:

You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License. (GPL section 2.)

The GPL, unlike most other licenses, requires that derivative works be licensed as a whole at no charge to third parties under the terms of this License.

The open source principles listed in Chapter 1 allow reciprocity conditions, under which a licensor can insist that li-censees operate on the exact same playing field as the licensor does. The GPL licensors distributed their ...

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