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Author's Rights
In conjunction with US copyright law, the NPL has established the following policies regarding author's rights to their works submitted to The ENIGMA:
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All material submitted for publication in The ENIGMA remains the full property and copyright of the author.
The NPL asserts and owns a copyright on its collections of works, including all issues of The ENIGMA and our web sites.
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The NPL retains the right to reproduce submitted material in any medium whose audience is primarily
NPL members or whose primary intent is NPL recruitment.
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If the NPL wishes to reproduce submitted material in a medium whose audience is broader than listed above,
it must get written permission from the author.
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Individual authors may freely republish their own puzzles anywhere they so choose (but are asked
to refrain from doing so until the solving deadlines for their puzzles have expired).