diff --git a/README.md b/README.md
index f1a335d..9431676 100644
--- a/README.md
+++ b/README.md
@@ -15,13 +15,13 @@
 </p>
 
 > [!IMPORTANT]
-> Files downloaded from the Internet may be blocked by Windows and fail to run. Before using this project, unblock every file in the downloaded folder:
+> Files downloaded from the Internet may be blocked by Windows and fail to run. First verify the official source and any available owner code signature or artifact attestation (see [SECURITY.md](SECURITY.md)); then unblock only the downloaded project folder:
 >
 > ```powershell
 > Get-ChildItem "C:\Chemin\Du\Dossier" -Recurse -File -Force | Unblock-File
 > ```
 >
-> Replace the example path with the folder where you downloaded or extracted this project.
+> Replace the example path with the folder where you downloaded or extracted this project. Do not unblock files whose source or integrity you cannot verify.
 >
 > The `Install-Module` commands in this documentation use `-Force`, so they also update or reinstall a module that is already installed. If an older version still conflicts, close every PowerShell window, open a new one (as administrator for `-Scope AllUsers`), run `Uninstall-Module <ModuleName> -AllVersions -Force`, then run the `Install-Module` command again.
 
@@ -114,7 +114,7 @@ The tests run against `tests\FakeExchange.ps1`, a fictitious organisation (conto
 
 ## License
 
-[MIT](LICENSE).
+[MIT](LICENSE). Author: Nicolas Fabert.
 
 ## Disclaimer
 
diff --git a/package/README.md b/package/README.md
index 430ff5d..b92ffc7 100644
--- a/package/README.md
+++ b/package/README.md
@@ -5,11 +5,13 @@ Moves the mailboxes of an Exchange Server organisation from source databases to
 This folder contains everything needed to run the tool: Invoke-ExchangeMailboxMigration.ps1, the module, the configuration, the report template and the guides. Tests and build tools stay outside it, in the repository.
 
 > [!IMPORTANT]
-> Files downloaded from the Internet may be blocked by Windows. Unblock them once, from this folder:
+> Files downloaded from the Internet may be blocked by Windows. First verify the official source and any available owner code signature or artifact attestation. Then unblock only this project folder:
 >
 > ```powershell
 > Get-ChildItem . -Recurse -File | Unblock-File
 > ```
+>
+> Do not unblock files whose source or integrity you cannot verify.
 
 ## Requirements
 - Exchange Server 2019 / Subscription Edition; Exchange 2016 uses the same cmdlets.
@@ -50,7 +52,7 @@ notepad .\config\ExchangeMailboxMigration.config.psd1      # Databases: source a
 
 Project page, releases and change log: https://github.com/Nico77600/ExchangeMailboxMigration
 
-License: [MIT](LICENSE).
+License: [MIT](LICENSE). Author: Nicolas Fabert.
 
 ## Disclaimer
 
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