Honest question, I thought projects including libraries using an Apache License 2.0 (like Bootstrap) needed to include a copy of such license. Is it a requireme

Honest question, I thought projects including libraries using an Apache License 2.0 (like Bootstrap) needed to include a copy of such license. Is it a requirement to include an actual copy: > You must give any other recipients of the Work or Derivative Works a copy of this License; and Is a simple mention, in the form of a link to the original Aoache License, enough?