The following pertains to versions of JQuery:

1. To be able to use JQuery libraries, do I need to buy some kind of a license? If so, would point me to a link that will tell me where to purchase this license from?

2. I know that I can point to a https url to obtain various links to jquery logic. However, I am wondering if I can obtain the exact JQuery down file logic that I can include in my application? I am asking this question since I am assuming that the jquery link may become deprecated at some point and no longer be valid. If this is possible, would you tell me when I can obtain the download code from? An example would be to point to the current version of jquery code which is version 3.0