Relax LICENSE copyright requirement for executable packers use cases?

[richarddd]

Is your feature request related to a problem? Please describe.
Executable packers like UPX can't use ZSTD due to the copyright requirements of the LICENSE, specifically this clause:

• Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

Describe the solution you'd like
Relax the requirement for this specific use case only, as this prevents using ZSTD in binary packers since there is nowhere for them to enforce copyright into the target binary, and requires redustributing as part of the decompression of the executable.

Describe alternatives you've considered
N/A

Additional context
Request for this support has been around for 7 years and is blocked by this, see upx/upx#295

[terrelln]

Leaving this issue open, but changing our license will likely be challenging.

In case you weren't aware Zstd is dual licensed under GPLv2: https://github.com/facebook/zstd/blob/dev/COPYING. I think that isn't useful for binary repackers, but IANAL, so maybe I'm wrong.

[richarddd]

@terrelln do you think a solution like this would qualify as "including license"?

Write license to a file descriptor and close it. In order to see the LICENSE, then the user may re-direct, such as 26>&2 to put the text onto stderr.

I guess technically the licence is included and you view it by redirecting the file descriptor.