diff --git a/odoo/addons/base/models/ir_model.py b/odoo/addons/base/models/ir_model.py
index 9c69d8057df..ae4ee63f335 100644
--- a/odoo/addons/base/models/ir_model.py
+++ b/odoo/addons/base/models/ir_model.py
@@ -1455,7 +1455,7 @@ class IrModelAccess(models.Model):
 
     name = fields.Char(required=True, index=True)
     active = fields.Boolean(default=True, help='If you uncheck the active field, it will disable the ACL without deleting it (if you delete a native ACL, it will be re-created when you reload the module).')
-    model_id = fields.Many2one('ir.model', string='Object', required=True, domain=[('transient', '=', False)], index=True, ondelete='cascade')
+    model_id = fields.Many2one('ir.model', string='Object', required=True, index=True, ondelete='cascade')
     group_id = fields.Many2one('res.groups', string='Group', ondelete='cascade', index=True)
     perm_read = fields.Boolean(string='Read Access')
     perm_write = fields.Boolean(string='Write Access')
@@ -1533,8 +1533,6 @@ class IrModelAccess(models.Model):
         # TransientModel records have no access rights, only an implicit access rule
         if model not in self.env:
             _logger.error('Missing model %s', model)
-        elif self.env[model].is_transient():
-            return True
 
         # We check if a specific rule exists
         self._cr.execute("""SELECT MAX(CASE WHEN perm_{mode} THEN 1 ELSE 0 END)
diff --git a/odoo/addons/base/models/ir_rule.py b/odoo/addons/base/models/ir_rule.py
index 7566a867384..e2703b36bd9 100644
--- a/odoo/addons/base/models/ir_rule.py
+++ b/odoo/addons/base/models/ir_rule.py
@@ -62,11 +62,6 @@ class IrRule(models.Model):
         for rule in self:
             rule['global'] = not rule.groups
 
-    @api.constrains('model_id')
-    def _check_model_transience(self):
-        if any(self.env[rule.model_id.model].is_transient() for rule in self):
-            raise ValidationError(_('Rules can not be applied on Transient models.'))
-
     @api.constrains('model_id')
     def _check_model_name(self):
         # Don't allow rules on rules records (this model).
diff --git a/odoo/models.py b/odoo/models.py
index 77ba7c8eaa3..db725cdff98 100644
--- a/odoo/models.py
+++ b/odoo/models.py
@@ -557,7 +557,7 @@ class BaseModel(MetaModel('DummyModel', (object,), {'_register': False})):
         if ModelClass._transient:
             assert ModelClass._log_access, \
                 "TransientModels must have log_access turned on, " \
-                "in order to implement their access rights policy"
+                "in order to implement their vacuum policy"
 
         # link the class to the registry, and update the registry
         ModelClass.pool = pool
@@ -3241,9 +3241,6 @@ Record ids: %(records)s
         forbidden = invalid.exists()
         if forbidden:
             # the invalid records are (partially) hidden by access rules
-            if self.is_transient():
-                raise AccessError(_('For this kind of document, you may only access records you created yourself.\n\n(Document type: %s)') % (self._description,))
-
             raise self.env['ir.rule']._make_access_error(operation, forbidden)
 
         # If we get here, the invalid records are not in the database.
@@ -4166,15 +4163,6 @@ Record ids: %(records)s
                     if table not in query.tables:
                         query.tables.append(table)
 
-        if self._transient:
-            # One single implicit access rule for transient models: owner only!
-            # This is ok because we assert that TransientModels always have
-            # log_access enabled, so that 'create_uid' is always there.
-            domain = [('create_uid', '=', self._uid)]
-            tquery = self._where_calc(domain, active_test=False)
-            apply_rule(tquery.where_clause, tquery.where_clause_params, tquery.tables)
-            return
-
         # apply main rules on the object
         Rule = self.env['ir.rule']
         where_clause, where_params, tables = Rule.domain_get(self._name, mode)
diff --git a/odoo/modules/loading.py b/odoo/modules/loading.py
index b5cde25115c..9b1efca7cc4 100644
--- a/odoo/modules/loading.py
+++ b/odoo/modules/loading.py
@@ -443,17 +443,10 @@ def load_modules(db, force_demo=False, status=None, update_module=False):
             env = api.Environment(cr, SUPERUSER_ID, {})
             cr.execute("""select model,name from ir_model where id NOT IN (select distinct model_id from ir_model_access)""")
             for (model, name) in cr.fetchall():
-                if model in registry and not registry[model]._abstract and not registry[model]._transient:
+                if model in registry and not registry[model]._abstract:
                     _logger.warning('The model %s has no access rules, consider adding one. E.g. access_%s,access_%s,model_%s,base.group_user,1,0,0,0',
                         model, model.replace('.', '_'), model.replace('.', '_'), model.replace('.', '_'))
 
-            # Temporary warning while we remove access rights on osv_memory objects, as they have
-            # been replaced by owner-only access rights
-            cr.execute("""select distinct mod.model, mod.name from ir_model_access acc, ir_model mod where acc.model_id = mod.id""")
-            for (model, name) in cr.fetchall():
-                if model in registry and registry[model]._transient:
-                    _logger.warning('The transient model %s (%s) should not have explicit access rules!', model, name)
-
             cr.execute("SELECT model from ir_model")
             for (model,) in cr.fetchall():
                 if model in registry: