Is it legal to share GOG games?

Excuse me, but I have a question regarding the legality of sharing GOG games. Could you please clarify whether it is permissible to do so? I understand that piracy and unauthorized distribution of copyrighted material are illegal, but I'm unsure about the specifics when it comes to sharing games purchased from GOG or similar platforms. Is there a specific policy or guideline that governs this matter? I'd appreciate it if you could provide some clarity on this issue.