diff --git a/sapl/materia/views.py b/sapl/materia/views.py
index 65c1deb97..3cae28756 100644
--- a/sapl/materia/views.py
+++ b/sapl/materia/views.py
@@ -1761,15 +1761,22 @@ class DocumentoAcessorioCrud(MasterDetailCrud):
 
         def get_context_data(self, **kwargs):
             context = super().get_context_data(**kwargs)
+            u = self.request.user
             is_autor = False
-            if self.request.user.is_authenticated:
+            if u.is_authenticated:
                 materia = self.object.materia
                 for autoria in materia.autoria_set.all():
                     if autoria.autor.operadores.filter(
-                            id=self.request.user.id).exists():
+                            id=u.id).exists():
                         is_autor = True
                         break
             context['is_autor'] = is_autor
+            context['pode_assinar'] = is_autor or (
+                u.is_authenticated and (
+                    u.is_superuser or
+                    u.has_perm('materia.change_documentoacessorio')
+                )
+            )
             return context
 
     class ListView(MasterDetailCrud.ListView):
diff --git a/sapl/templates/materia/documentoacessorio_detail.html b/sapl/templates/materia/documentoacessorio_detail.html
index 12b9f77dc..c6b7fef47 100644
--- a/sapl/templates/materia/documentoacessorio_detail.html
+++ b/sapl/templates/materia/documentoacessorio_detail.html
@@ -16,7 +16,7 @@
                 <a class="btn btn-success" href="{% url 'sapl.materia:docacessorio_pdf_assinado' object.pk %}" target="_blank">
                     <i class="fa fa-check-circle"></i> {% trans "Ver PDF Assinado" %}
                 </a>
-            {% elif is_autor %}
+            {% elif pode_assinar %}
                 <button type="button" class="btn btn-warning" data-toggle="modal" data-target="#assinaturaModal">
                     <i class="fa fa-certificate"></i> {% trans "Assinar PDF Digitalmente" %}
                 </button>
@@ -76,7 +76,7 @@
 
 {% block extra_js %}
 {{ block.super }}
-{% if object.arquivo and not object.pdf_assinado and is_autor %}
+{% if object.arquivo and not object.pdf_assinado and pode_assinar %}
   {% include "materia/assinatura_modal.html" %}
   <script>
     document.addEventListener('DOMContentLoaded', function() {