On 2015-Apr-20 15:39 , Mark Cave-Ayland wrote:
According to Wikipedia (*ahem*), the zlib license is deemed GPL-compatible so I don't believe the license should be an issue here.
Please don't quote Wikipedia, quote the source it cites:
https://www.gnu.org/licenses/license-list.html#ZLib
According to *Gnu.org*, Zlib is compatible with the GPL.