diff --git a/ack-sync b/ack-sync
index a5aac85..726a7ff 100755
--- a/ack-sync
+++ b/ack-sync
@@ -32,6 +32,7 @@ from ubuntutools.lp.libsupport import get_launchpad
 COMMAND_LINE_SYNTAX_ERROR = 1
 VERSION_DETECTION_FAILED = 2
 PRIVATE_USER_EMAIL = 3
+UPLOAD_NOT_PERMITTED = 4
 
 def get_version(title):
 	m = re.search("[() ][0-9][0-9a-zA-Z.:+-~]*", title)
@@ -145,7 +146,8 @@ def main(bug_numbers, all_package, all_version, all_section, update,
          all_uploader_email, key, verbose=False, silent=False):
 	launchpad = get_launchpad("ubuntu-dev-tools")
 	# TODO: use release-info (once available)
-	dist = launchpad.distributions["ubuntu"].current_series.name
+	series = launchpad.distributions["ubuntu"].current_series
+	dist = series.name
 
 	# update pbuilder
 	if update:
@@ -177,22 +179,6 @@ def main(bug_numbers, all_package, all_version, all_section, update,
 
 		task = list(bug.bug_tasks)[0]
 
-		if task.assignee == None:
-			task.assignee = launchpad.me
-			print "assigned me"
-			task.lp_save()
-		if task.assignee != launchpad.me:
-			print >> sys.stderr, "E: %s is already assigned to https://launchpad.net/bugs/%i" % \
-					(task.assignee.display_name, bug.id)
-			sys.exit(1)
-		old_status = task.status
-		task.status = 'In Progress'
-		unsubscribe_sponsors(launchpad, bug)
-		if task.importance == "Undecided":
-			task.importance = "Wishlist"
-			print "importance set to Wishlist"
-		task.lp_save()
-
 		if all_package is not None:
 			package = all_package
 		else:
@@ -210,6 +196,29 @@ def main(bug_numbers, all_package, all_version, all_section, update,
 			version = all_version
 		else:
 			version = get_version(bug.title)
+
+		if not series.main_archive.isSourceUploadAllowed(person=launchpad.me,
+				sourcepackagename=package):
+			print >> sys.stderr, ("E: Sorry, you are not allowed to "
+				'upload package "%s" to %s.' % (package, dist))
+			sys.exit(UPLOAD_NOT_PERMITTED)
+
+		if task.assignee == None:
+			task.assignee = launchpad.me
+			print "assigned me"
+			task.lp_save()
+		if task.assignee != launchpad.me:
+			print >> sys.stderr, "E: %s is already assigned to https://launchpad.net/bugs/%i" % \
+					(task.assignee.display_name, bug.id)
+			sys.exit(1)
+		old_status = task.status
+		task.status = 'In Progress'
+		unsubscribe_sponsors(launchpad, bug)
+		if task.importance == "Undecided":
+			task.importance = "Wishlist"
+			print "importance set to Wishlist"
+		task.lp_save()
+
 		print "package:", package
 		print "version:", version
 		dsc_file = get_source(package, version, all_section, dist,