Remove license header from every file

LICENSE

@@ -1,6 +1,6 @@
 The MIT License
 
-Copyright (c) 2020 Temporal Technologies Inc.  All rights reserved.
+Copyright (c) 2025 Temporal Technologies Inc.  All rights reserved.
 
 Copyright (c) 2020 Uber Technologies, Inc.
 

Makefile

@@ -16,7 +16,6 @@ ci-build-misc: \
 	go-generate \
 	buf-breaking \
 	shell-check \
-	copyright-check \
 	goimports \
 	gomodtidy \
 	ensure-no-changes
@@ -342,14 +341,6 @@ temporal-server-debug: $(ALL_SRC)
 	CGO_ENABLED=$(CGO_ENABLED) go build $(BUILD_TAG_FLAG),TEMPORAL_DEBUG -o temporal-server-debug ./cmd/server
 
 ##### Checks #####
-copyright-check:
-	@printf $(COLOR) "Check license header..."
-	@go run ./cmd/tools/copyright/licensegen.go --verifyOnly
-
-copyright:
-	@printf $(COLOR) "Fix license header..."
-	@go run ./cmd/tools/copyright/licensegen.go
-
 goimports: fmt-imports
 	@printf $(COLOR) "Run goimports for all files..."
 	@UNGENERATED_FILES=$$(find . -type f -name '*.go' -print0 | xargs -0 grep -L -e "Code generated by .* DO NOT EDIT." || true) && \
@@ -394,7 +385,7 @@ workflowcheck: $(WORKFLOWCHECK)
 		$(WORKFLOWCHECK) "$$dir" ; \
 	done
 
-check: copyright-check lint shell-check
+check: lint shell-check
 
 ##### Tests #####
 clean-test-output:
@@ -622,7 +613,6 @@ update-dependencies-major: $(GOMAJOR)
 go-generate: $(MOCKGEN) $(GOIMPORTS) $(STRINGER) $(GOWRAP)
 	@printf $(COLOR) "Process go:generate directives..."
 	@go generate ./...
-	$(MAKE) copyright
 
 ensure-no-changes:
 	@printf $(COLOR) "Check for local changes..."