dl: add LICENSE, AUTHORS, CONTRIBUTORS, PATENTS, CONTRIBUTING.md
These files should've been here when the repository was initially
created, but they were unintentionally forgotten. Better late than
never, so add them now.
Fixes golang/go#33942
Change-Id: I59fe6b9a3e2288089eb1211c5dc7f27b675f3d3a
Reviewed-on: https://go-review.googlesource.com/c/dl/+/195439
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/PATENTS b/PATENTS
new file mode 100644
index 0000000..7330990
--- /dev/null
+++ b/PATENTS
@@ -0,0 +1,22 @@
+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Google as part of the Go project.
+
+Google hereby grants to You a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable (except as stated in this section)
+patent license to make, have made, use, offer to sell, sell, import,
+transfer and otherwise run, modify and propagate the contents of this
+implementation of Go, where such license applies only to those patent
+claims, both currently owned or controlled by Google and acquired in
+the future, licensable by Google that are necessarily infringed by this
+implementation of Go. This grant does not include claims that would be
+infringed only as a consequence of further modification of this
+implementation. If you or your agent or exclusive licensee institute or
+order or agree to the institution of patent litigation against any
+entity (including a cross-claim or counterclaim in a lawsuit) alleging
+that this implementation of Go or any code incorporated within this
+implementation of Go constitutes direct or contributory patent
+infringement, or inducement of patent infringement, then any patent
+rights granted to you under this License for this implementation of Go
+shall terminate as of the date such litigation is filed.
