On Sun, 30 Dec 2012, John Funnell wrote:
When a user makes their first copy, their acceptance of the
anti-patent license is also an agreement to the restrictions on usage.
If a US person violates this by entering into an agreement for a
limited-scope patent license, they violate their original copyright
license and are thus not allowed to copy, own or use the software.

But can it retroactively invalidate an existing copy?

If I write a license saying someone can only copy the software if they
are a vegetarian, and they copy the software and start eating meat later on,
they still were a vegetarian at the moment they copied the software.  You
won't be able to use the copy restriction like a use restriction because the
copy restriction only applies to conditions that are true when the copy was
made.
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