While it is clear what a "Contributor" to an Apache 2.0 licensed software has to do when its work abide to the license I am struggling with what an user of an Apache 2.0 library has to do in the following situation:
The user has a patent on something that the Apache 2.0 licensed library is infringing. By preparing and distributing a work that includes the library, does the user lose exclusive rights to this patent?
Does the usage of a Apache 2.0 library in another work make the user's work a "Derivative" one?
Can the user forbid the usage of the library due to patent it holds are infringed? Is this a correct interpretation of the non-assertion clause?