Please obtain, read, and make sure you understand the full text of the APSL. For a quick first glance, here is an excerpt (emphasis added):
2. (...) Apple hereby grants You, (...) a world-wide, royalty-free, non-exclusive license (...) to do the following:
2.1 Unmodified Code.
*You may (...) Externally Deploy verbatim, unmodified copies* of the Original Code, for commercial or non-commercial purposes, provided that in each instance:
(a) You must retain (...) the *copyright and other proprietary notices* (...)
(b) You must *include a copy of this License* (...) and You may not (...) alter or restrict this License (...)
2.2 Modified Code.
*You may modify (...) and Externally Deploy Your Modifications* and Covered Code, for commercial or non-commercial purposes, provided that (...):
(a) You must *satisfy all the conditions of Section 2.1* (...)
(b) You must duplicate (...) the *notice in Exhibit A* in each file of the Source Code of all Your Modifications, and cause the modified files to carry prominent *notices stating that You changed the files and the date of any change*; and
(c) If You Externally Deploy Your Modifications, You must *make Source Code* (...) *available* (...) under the terms set forth in this License, including the license grants set forth in Section 3 below (...).
2.3 Distribution of Executable Versions.
(...) must include a prominent notice, in the code itself as well as in related documentation, stating that Source Code of the Covered Code is available under the terms of this License with *information on how and where to obtain* (...) *Source Code*.
3. Your Grants.
(...) You hereby *grant* (...) a non-exclusive, royalty-free, perpetual, irrevocable *license*, (...) of the same scope and extent as Apple's licenses under Sections 2.1 and 2.2 above.
4. Larger Works.
You *may create a Larger Work* by combining Covered Code with other code not governed by the terms of this License and distribute the Larger Work as a single product. (...)