I'm sorry if this has been answered elsewhere, but this question is, I think, important for mod makers to have a clear cut and easily pointed to answer for.
Do modders have legal permission to import assets from Legend of Grimrock 1 for sole use in Legend of Grimrock 2 mods/custom dungeons?
An important Legal question for the Devs at Almost Human
Re: An important Legal question for the Devs at Almost Human
Yes, you can use imported and/or modified Grimrock 1 assets in Grimrock 2 mods. 

Steven Seagal of gaming industry
Re: An important Legal question for the Devs at Almost Human
I thought that would be your answer. But I wanted official clarification.
Awesome. Thank you antti.
Can I also request a sticky for this topic?
Awesome. Thank you antti.
Can I also request a sticky for this topic?