Is Apache 2.0 License Free?
You can use any Apache License 2.0 licensed software in your commercial products for free. However, you must not name your product in a way that it looks like an endorsement from Apache.
How do I get Apache 2.0 license?
You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Apache License, Version 2.0
Is Apache 2.0 a permissive license?
The Apache License 2.0 is in the permissive category, meaning that users can do (nearly) anything they want with the code, with very few exceptions.
Open Source Licenses 101: Apache License 2.0 - FOSSA
The Apache License is a permissive free software license written by the Apache Software Foundation (ASF). It allows users to use the software for any purpose, to distribute it, to modify it, and to distribute modified versions of the software under the terms of the license, without concern for royalties.
Apache License - Wikipedia
Open-source licensed software is mostly available free of charge, though this does not necessarily have to be the case. Licenses which only permit non-commercial redistribution or modification of the source code for personal use only are generally not considered as open-source licenses.
Open-source license - Wikipedia