diff --git a/scripts/add_license.sh b/scripts/add_license.sh
index 43e69aa88..dd51ed0a1 100755
--- a/scripts/add_license.sh
+++ b/scripts/add_license.sh
@@ -2,40 +2,35 @@
 #
 # Checks if the source code contains required license and adds it if necessary.
 # Returns 1 if there was a missing license, 0 otherwise.
-COPYRIGHT_TXT=$(dirname $0)/copyright.txt
-
-# Any year is fine. We can update the year as a single PR in all files that have it up to last year.
-PAT_PL=".*// Copyright 2021-202\d Protocol Labs.*"
-# Files that were taken from ChainSafe and not modified can be left as-is.
-PAT_CS=".*// Copyright 2019-2022 ChainSafe Systems.*"
-PAT_SPDX="/*// SPDX-License-Identifier: Apache-2.0, MIT.*"
-
-# Look at enough lines so that we can include multiple copyright holders.
-LINES=4
-
+YEAR="$(date '+%Y')"
 ret=0
+set -e -x
 
 # Look for files without headers.
-for file in $(git grep --cached -Il '' -- '*.rs'); do
-  header=$(head -$LINES "$file")
-	if ! echo "$header" | grep -q -P "$PAT_SPDX"; then
-		echo "$file was missing header"
-		cat $COPYRIGHT_TXT "$file" > temp
-		mv temp "$file"
-		ret=1
-	fi
-done
+while read -r file; do
+    echo "$file was missing header"
+    sed -i "$file" -f - <<EOF
+1i\
+// SPDX-License-Identifier: Apache-2.0, MIT'
+EOF
+    ret=1
+done < <(git grep -IL "^// SPDX-License-Identifier:" -- '*.rs')
 
-# Look for changes that don't have the new copyright holder.
-for file in $(git diff --diff-filter=d --name-only master -- '*.rs'); do
-  header=$(head -$LINES "$file")
-	if ! echo "$header" | grep -q -P "$PAT_PL"; then
-		echo "$file was missing Protocol Labs"
-		head -1 $COPYRIGHT_TXT > temp
-		cat "$file" >> temp
-		mv temp "$file"
-		ret=1
-	fi
-done
+while read -r file; do
+    if grep -q "^// Copyright \([0-9]\+-\)\?${YEAR} Filecoin Core Devs" "$file"; then
+        continue
+    fi
+    ret=1
+    if grep -q "^// Copyright [0-9]\+\(-[0-9]\+\)\? Filecoin Core Devs" "$file"; then
+        # Update the copyright line if available.
+        script="s|^// Copyright \([0-9]\+\)\(-[0-9]\+\)\? Filecoin Core Devs|// Copyright \1-${YEAR} Filecoin Core Devs|"
+    else
+        # Otherwise, add the new one _AFTER_ the SDPX header.
+        script="/^\/\/ SPDX-License-Identifier: /a\
+// Copyright ${YEAR} Filecoin Core Devs
+"
+    fi
+    sed -i "$file" -e "$script"
+done < <(git diff --diff-filter=DM --name-only --merge-base master -- '*.rs')
 
 exit $ret
diff --git a/scripts/copyright.txt b/scripts/copyright.txt
deleted file mode 100644
index 163f7b93b..000000000
--- a/scripts/copyright.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-// Copyright 2021-2023 Protocol Labs
-// SPDX-License-Identifier: Apache-2.0, MIT