The Free-Rider Problem
The second question posed above is actually the easier one. Under Open Source Principles # 2 and 3, it is impossible to completely prevent free-riders in open source. All licensees are free to copy and create derivative works without payment of royalties to the licensor, and so a licensee can make as many copies of such software as possible without rewarding the licensor with even a peppercorn as payment.
If it is important to discourage free-riders who create and distribute derivative works, then a reciprocal license is often more effective than an academic license. At least with reciprocal licenses, everyone is a free-rider of everyone else's distributed derivative works, because that software is licensed under the same ...
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