Well, the Apache license is different from GPL in that you are not required to distribute any source, and your "derivative works" do not fall under the license.

Well, the Apache license is different from GPL in that you are not required to distribute any source, and your "derivative works" do not fall under the license. I can freely use Apache licensed software and jumble in all my patents and even statically link it all together there is no impact to my patents whatsoever. The point you make covers contributors, which is great! It means if I contribute to an open-source project that uses the Apache license, there are no catches, not even if I contributed something I or my company has patented. So you, as an end user, or consumer of this software, are safe w.r.t. patents. Hurray! (Again, IANAL!)