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vendor/tailscale.com/PATENTS

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+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Tailscale Inc. as part of the Tailscale project.
+
+Tailscale Inc. 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 Tailscale, where such license
+applies only to those patent claims, both currently owned or
+controlled by Tailscale Inc. and acquired in the future, licensable
+by Tailscale Inc. that are necessarily infringed by this
+implementation of Tailscale.  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 Tailscale or any code
+incorporated within this implementation of Tailscale 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 Tailscale shall terminate as of the date
+such litigation is filed.