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  The original Apache license was similar to the Berkeley license,
  but source code published under version 2 of the Apache license is
  subject to additional restrictions and cannot be included into OpenBSD.
+ In particular, if you use code under the Apache 2 license, some of
+ your rights will terminate if you claim in court that the code
+ violates a patent.
+ <p>
+ 
+ A license can only be considered fully permissive if it allows use
+ by anyone for all the future without giving up any of their rights.
+ If there are conditions that might terminate any rights in the
+ future, or if you have to give up a right that you would otherwise
+ have, even if exercising that right could reasonably be regarded
+ as morally objectionable, the code is not free.
+ <p>
+ 
+ In addition, the clause about the patent license is problematic because
+ a patent license cannot be granted under Copyright law, but only under
+ contract law, which drags the whole license into the domain of contract
+ law.  But while Copyright law is somewhat standardized by international
+ agreements, contract law differs wildly among jurisdictions.  So what
+ the license means in different jurisdictions may vary and is hard to
+ predict.
  <p>
  
  <dt>ISC<dd><p>