diff --git a/project_release/project-release-serve-history.php b/project_release/project-release-serve-history.php
index 7c5fc1c..0a4f5e5 100644
--- a/project_release/project-release-serve-history.php
+++ b/project_release/project-release-serve-history.php
@@ -19,9 +19,19 @@
  *   location ^= /release-history {
  *     rewrite ^/(.*)$ /modules/project/project_release/project-release-serve-history.php?q=$1;
  *   }
+ * @endcode
+ *
+ * To call this file directly (without the rewrite):
  *
+ * @code
+ * http://example.com/modules/project/project_release/project-release-serve-history.php?q=example_project/1.x&version=1.x-1.0.0&site_key=JF7UsBYsZDXiUL3j97rdUAp49X1WNvsEW-Y4uheoRHw
  * @endcode
  *
+ * Or with the rewrite in place:
+ *
+ * @code
+ * http://example.com/release-history/example_project/1.x?version=1.x-1.0.0&site_key=JF7UsBYsZDXiUL3j97rdUAp49X1WNvsEW-Y4uheoRHw
+ * @endcode
  *
  * Configuration within this file is usually unnecessary and settings should be
  * automatically determined. If manual setting of the BACKDROP_ROOT or
@@ -90,7 +100,7 @@
   $version_api = $args[1];
 }
 
-// Sanitize the user-supplied input for use in filenames.
+// Sanitize the user-supplied input for use in file names.
 $whitelist_regexp = '@[^a-zA-Z0-9_.-]@';
 $safe_project_name = preg_replace($whitelist_regexp, '#', $project_name);
 $safe_api_vers = preg_replace($whitelist_regexp, '#', $version_api);
@@ -129,9 +139,12 @@
   // We can't call module_exists without bootstrapping to a higher level so
   // we'll settle for checking that the table exists.
   if (db_table_exists('project_usage_raw')) {
+    // Have to include password.inc for user_hash_password().
+    require_once BACKDROP_ROOT . '/' . settings_get('password_inc', 'core/includes/password.inc');
+
     $site_key = $_GET['site_key'];
     $project_version = isset($_GET['version']) ? $_GET['version'] : '';
-    $ip_address = ip_address();
+    $ip_address_hashed = user_hash_password(ip_address());
 
     // Compute a GMT timestamp for beginning of the day. getdate() is
     // affected by the server's timezone so we need to cancel it out.
@@ -139,9 +152,23 @@
     $time_parts = getdate($now - date('Z', $now));
     $timestamp = gmmktime(0, 0, 0, $time_parts['mon'], $time_parts['mday'], $time_parts['year']);
 
-    $result = db_query("UPDATE {project_usage_raw} SET version_api = :version_api, version = :version, hostname = :hostname WHERE name = :name AND timestamp = :timestamp AND site_key = :site_key", array(':version_api' => $version_api, ':version' => $project_version, ':hostname' => $ip_address, ':name' => $project_name, ':timestamp' => $timestamp, ':site_key' => $site_key));
+    $result = db_query("UPDATE {project_usage_raw} SET version_api = :version_api, version = :version, hostname = :hostname WHERE name = :name AND timestamp = :timestamp AND site_key = :site_key", array(
+      ':version_api' => $version_api,
+      ':version' => $project_version,
+      ':hostname' => $ip_address_hashed,
+      ':name' => $project_name,
+      ':timestamp' => $timestamp,
+      ':site_key' => $site_key,
+    ));
     if ($result->rowCount() === 0) {
-      db_query("INSERT INTO {project_usage_raw} (name, timestamp, site_key, version_api, version, hostname) VALUES (:name, :timestamp, :site_key, :version_api, :version, :hostname)", array(':name' => $project_name, ':timestamp' => $timestamp, ':site_key' => $site_key, ':version_api' => $version_api, ':version' => $project_version, ':hostname' => $ip_address));
+      db_query("INSERT INTO {project_usage_raw} (name, timestamp, site_key, version_api, version, hostname) VALUES (:name, :timestamp, :site_key, :version_api, :version, :hostname)", array(
+        ':name' => $project_name,
+        ':timestamp' => $timestamp,
+        ':site_key' => $site_key,
+        ':version_api' => $version_api,
+        ':version' => $project_version,
+        ':hostname' => $ip_address_hashed,
+      ));
     }
   }
 }
diff --git a/project_usage/project-usage-process.php b/project_usage/project-usage-process.php
old mode 100644
new mode 100755
index e667a7e..8fa96e7
--- a/project_usage/project-usage-process.php
+++ b/project_usage/project-usage-process.php
@@ -3,6 +3,19 @@
 /**
  * @file
  * Processes the project_usage statistics.
+ *
+ * This script should be run from the command line, with a similar format:
+ *
+ * @code
+ * ./project-usage-process.php --url=http://example.com --root=/var/www/html
+ * @endcode
+ *
+ * Running this on a cron job could look like this:
+ *
+ * @code
+ * # Run once per hour:
+ * 0 * * * * /var/www/html/modules/contrib/project/project_usage/project-usage-process.php --url=http://example.com --root=/var/html/www
+ * @endcode
  */
 
 // Define the root directory of the Backdrop installation.
diff --git a/project_usage/project_usage.install b/project_usage/project_usage.install
index 6ade0e9..50ac0ac 100644
--- a/project_usage/project_usage.install
+++ b/project_usage/project_usage.install
@@ -80,7 +80,7 @@ function project_usage_schema() {
         'default' => 0,
       ),
       'hostname' => array(
-        'description' => 'The IP address of the incoming request (to detect possible abuse).',
+        'description' => 'The hashed IP address of the incoming request. Actual IP address is not logged for privacy.',
         'type' => 'varchar',
         'length' => 128,
         'not null' => TRUE,
@@ -133,7 +133,7 @@ function project_usage_schema() {
         'length' => 128,
         'not null' => TRUE,
         'default' => '',
-        'description' => "The IP address of the incoming request (to detect possible abuse).",
+        'description' => 'The hashed IP address of the incoming request. Actual IP address is not logged for privacy.',
       ),
     ),
     'primary key' => array('timestamp', 'site_key', 'project_nid'),
@@ -250,3 +250,34 @@ function project_usage_schema() {
   return $schema;
 }
 
+/**
+ * Hash IP addresses for privacy.
+ */
+function project_usage_update_1000() {
+  // Include password.inc for user_hash_password().
+  require_once BACKDROP_ROOT . '/' . settings_get('password_inc', 'core/includes/password.inc');
+
+  // Update raw values. Hashed IPs have a longer value (55 characters) than an
+  // IP address (16 characters max).
+  $raw_rows = db_query("SELECT hostname FROM {project_usage_raw} WHERE LENGTH(hostname) < :hash_length GROUP BY hostname", array(
+    'hash_length' => BACKDROP_HASH_LENGTH,
+  ));
+
+  foreach ($raw_rows as $raw_row) {
+    db_query("UPDATE {project_usage_raw} SET hostname = :hostname_hashed WHERE :hostname = :hostname", array(
+      'hostname_hashed' => $raw_row->hostname,
+      'hostname' => user_hash_password($raw_row->hostname),
+    ));
+  }
+
+  // Update daily values with a hashed IP address.
+  $day_rows = db_query("SELECT hostname FROM {project_usage_day} WHERE LENGTH(hostname) < :hash_length GROUP BY hostname", array(
+    'hash_length' => BACKDROP_HASH_LENGTH,
+  ));
+  foreach ($day_rows as $day_row) {
+    db_query("UPDATE {project_usage_day} SET hostname = :hostname_hashed WHERE hostname = :hostname", array(
+      ':hostname_hashed' => user_hash_password($day_row->hostname),
+      ':hostname' => $day_row->hostname,
+    ));
+  }
+}