Inquiry on GPLv3 Compatibility of System.IO.Compression.ZipFile

[gnh1201]

Hello,

I am currently maintaining an open-source project licensed under the GNU General Public License v3 (GPLv3), based on the .NET Framework 4.7.2.

Recently, during a code review, a concern was raised by a team at a large enterprise (an automobile manufacturer in our country) regarding the inclusion of the System.IO.Compression.ZipFile package. Their concern was that this package might not be compatible with GPLv3 due to the possibility of proprietary licensing requirements and that its inclusion should have been reviewed more thoroughly before use.

To avoid potential legal complications and in respect of their concern, we urgently removed the dependency from the project. However, upon reviewing the source repository (e.g., on GitHub), the package appears to be licensed under the MIT License.

Given this, I would like to confirm whether linking or referencing System.IO.Compression.ZipFile in a GPLv3-licensed project poses any actual license compatibility issues. We are open to relicensing the project under a more permissive license such as the Microsoft Reciprocal License (MS-RL) if absolutely necessary, but would prefer to remain with GPLv3 if no real conflict exists.

I would greatly appreciate any clarification or guidance you could provide on this matter.

[huoyaoyuan]

Regardless of license, you shouldn't be using the package at all. It provides zero addition on every support framework and only delegates to the inbox version from .NET Framework.