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.