If I receive source code under the Apache License 2.0 and intent to redistribute it to a third party, do I have to do so under the same terms? It seems at first glance that I can sublicense it under more permissive terms.
The license states only the following conditions under Redistribution:
(a) You must give any other recipients of the Work or Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and
(d) [Handling of NOTICE text file]
So I must retain the copyright notices etc. and must provide the third party with a copy of the Apache License. But where is stated that – in the license between the third party and myself – I must require them to adhere to the Apache License?
It seems I could follow the Apache License and include all the neccessary words with my source code, but be much more permissive in the license I actually give to the receipient of the source.
Note I don't neccessarily think this is the case, but I would like to understand exactly what terms allow the Apache License to propagate.