diff --git a/src/db/db/dbAsIfFlatRegion.cc b/src/db/db/dbAsIfFlatRegion.cc
index 31780d0eb..b6b3a80b7 100644
--- a/src/db/db/dbAsIfFlatRegion.cc
+++ b/src/db/db/dbAsIfFlatRegion.cc
@@ -1017,7 +1017,7 @@ EdgePairsDelegate *
 AsIfFlatRegion::cop_to_edge_pairs (db::CompoundRegionOperationNode &node, db::PropertyConstraint prop_constraint)
 {
   std::unique_ptr<FlatEdgePairs> output (new FlatEdgePairs ());
-  if (prop_constraint == db::IgnoreProperties) {
+  if (pc_skip (prop_constraint)) {
     region_cop_impl<db::EdgePair> (this, &output->raw_edge_pairs (), node);
   } else {
     region_cop_with_properties_impl<db::EdgePair> (this, &output->raw_edge_pairs (), output->properties_repository (), node, prop_constraint);
@@ -1029,7 +1029,7 @@ RegionDelegate *
 AsIfFlatRegion::cop_to_region (db::CompoundRegionOperationNode &node, db::PropertyConstraint prop_constraint)
 {
   std::unique_ptr<FlatRegion> output (new FlatRegion ());
-  if (prop_constraint == db::IgnoreProperties) {
+  if (pc_skip (prop_constraint)) {
     region_cop_impl<db::Polygon> (this, &output->raw_polygons (), node);
   } else {
     region_cop_with_properties_impl<db::Polygon> (this, &output->raw_polygons (), output->properties_repository (), node, prop_constraint);
@@ -1041,7 +1041,7 @@ EdgesDelegate *
 AsIfFlatRegion::cop_to_edges (db::CompoundRegionOperationNode &node, PropertyConstraint prop_constraint)
 {
   std::unique_ptr<FlatEdges> output (new FlatEdges ());
-  if (prop_constraint == db::IgnoreProperties) {
+  if (pc_skip (prop_constraint)) {
     region_cop_impl<db::Edge> (this, &output->raw_edges (), node);
   } else {
     region_cop_with_properties_impl<db::Edge> (this, &output->raw_edges (), output->properties_repository (), node, prop_constraint);
@@ -1113,7 +1113,7 @@ EdgePairsDelegate *
 AsIfFlatRegion::run_check (db::edge_relation_type rel, bool different_polygons, const Region *other, db::Coord d, const RegionCheckOptions &options) const
 {
   //  force different polygons in the different properties case to skip intra-polygon checks
-  if (options.prop_constraint == DifferentPropertiesConstraint) {
+  if (pc_always_different (options.prop_constraint)) {
     different_polygons = true;
   }
 
@@ -1159,7 +1159,7 @@ AsIfFlatRegion::run_check (db::edge_relation_type rel, bool different_polygons,
   std::vector<db::Shapes *> results;
   results.push_back (&output->raw_edge_pairs ());
 
-  if (options.prop_constraint == db::IgnoreProperties) {
+  if (pc_skip (options.prop_constraint)) {
 
     db::check_local_operation<db::Polygon, db::Polygon> op (check, different_polygons, primary_is_merged, has_other, other_is_merged, options);
 
@@ -1209,7 +1209,7 @@ AsIfFlatRegion::run_single_polygon_check (db::edge_relation_type rel, db::Coord
 
   for (RegionIterator p (begin_merged ()); ! p.at_end (); ++p) {
 
-    edge2edge_check_negative_or_positive<db::Shapes> edge_check (check, result->raw_edge_pairs (), options.negative, false /*=same polygons*/, false /*=same layers*/, options.shielded, true /*symmetric edge pairs*/, options.prop_constraint == db::IgnoreProperties ? 0 : pm (p.prop_id ()));
+    edge2edge_check_negative_or_positive<db::Shapes> edge_check (check, result->raw_edge_pairs (), options.negative, false /*=same polygons*/, false /*=same layers*/, options.shielded, true /*symmetric edge pairs*/, pc_remove (options.prop_constraint) ? 0 : pm (p.prop_id ()));
     poly2poly_check<db::Polygon> poly_check (edge_check);
 
     do {
@@ -1364,7 +1364,7 @@ AsIfFlatRegion::and_with (const Region &other, PropertyConstraint property_const
     //  Nothing to do
     return new EmptyRegion ();
 
-  } else if (property_constraint == db::IgnoreProperties && is_box () && other.is_box ()) {
+  } else if (pc_skip (property_constraint) && is_box () && other.is_box ()) {
 
     //  @@@ TODO: implement this with property constraints as that is important for the clip implementation!
 
@@ -1373,7 +1373,7 @@ AsIfFlatRegion::and_with (const Region &other, PropertyConstraint property_const
     b &= other.bbox ();
     return region_from_box (b);
 
-  } else if (property_constraint == db::IgnoreProperties && is_box () && ! other.strict_handling ()) {
+  } else if (pc_skip (property_constraint) && is_box () && ! other.strict_handling ()) {
 
     //  @@@ TODO: implement this with property constraints as that is important for the clip implementation!
 
@@ -1390,7 +1390,7 @@ AsIfFlatRegion::and_with (const Region &other, PropertyConstraint property_const
 
     return new_region.release ();
 
-  } else if (property_constraint == db::IgnoreProperties && other.is_box () && ! strict_handling ()) {
+  } else if (pc_skip (property_constraint) && other.is_box () && ! strict_handling ()) {
 
     //  @@@ TODO: implement this with property constraints as that is important for the clip implementation!
 
@@ -1443,7 +1443,7 @@ AsIfFlatRegion::not_with (const Region &other, PropertyConstraint property_const
 RegionDelegate *
 AsIfFlatRegion::and_or_not_with (bool is_and, const Region &other, PropertyConstraint property_constraint) const
 {
-  if (property_constraint == db::IgnoreProperties) {
+  if (pc_skip (property_constraint)) {
 
     //  Generic case
     db::EdgeProcessor ep (report_progress (), progress_desc ());
@@ -1520,7 +1520,7 @@ AsIfFlatRegion::andnot_with (const Region &other, PropertyConstraint property_co
     //  Nothing to do
     return std::make_pair (new EmptyRegion (), clone ());
 
-  } else if (property_constraint == db::IgnoreProperties) {
+  } else if (pc_skip (property_constraint)) {
 
     //  Generic case
     db::EdgeProcessor ep (report_progress (), progress_desc ());
diff --git a/src/db/db/dbCompoundOperation.cc b/src/db/db/dbCompoundOperation.cc
index 45b9879f2..f63ca361d 100644
--- a/src/db/db/dbCompoundOperation.cc
+++ b/src/db/db/dbCompoundOperation.cc
@@ -1549,7 +1549,7 @@ CompoundRegionCheckOperationNode::CompoundRegionCheckOperationNode (CompoundRegi
   set_description ("check");
 
   //  force different polygons in the different properties case to skip intra-polygon checks
-  if (m_options.prop_constraint == DifferentPropertiesConstraint) {
+  if (pc_always_different (m_options.prop_constraint)) {
     m_different_polygons = true;
   }
 
diff --git a/src/db/db/dbCompoundOperation.h b/src/db/db/dbCompoundOperation.h
index b48e6cdaf..5c3c63c9d 100644
--- a/src/db/db/dbCompoundOperation.h
+++ b/src/db/db/dbCompoundOperation.h
@@ -1658,7 +1658,7 @@ protected:
 
       for (size_t n = 0; n < results.size (); ++n) {
         for (auto i = results_wo_props [n].begin (); i != results_wo_props [n].end (); ++i) {
-          results [n].insert (db::object_with_properties<TR> (*i, s2p->first));
+          results [n].insert (db::object_with_properties<TR> (*i, pc_norm (m_prop_constraint, s2p->first)));
         }
       }
 
diff --git a/src/db/db/dbDeepRegion.cc b/src/db/db/dbDeepRegion.cc
index 1becfa40e..c0630158d 100644
--- a/src/db/db/dbDeepRegion.cc
+++ b/src/db/db/dbDeepRegion.cc
@@ -858,7 +858,7 @@ DeepRegion::and_or_not_with (const DeepRegion *other, bool and_op, db::PropertyC
 {
   DeepLayer dl_out (deep_layer ().derived ());
 
-  if (property_constraint == db::IgnoreProperties) {
+  if (pc_skip (property_constraint)) {
 
     db::BoolAndOrNotLocalOperation op (and_op);
 
@@ -893,7 +893,7 @@ DeepRegion::and_and_not_with (const DeepRegion *other, PropertyConstraint proper
   DeepLayer dl_out1 (deep_layer ().derived ());
   DeepLayer dl_out2 (deep_layer ().derived ());
 
-  if (property_constraint == db::IgnoreProperties) {
+  if (pc_skip (property_constraint)) {
 
     db::TwoBoolAndNotLocalOperation op;
 
@@ -1840,7 +1840,7 @@ EdgePairsDelegate *
 DeepRegion::cop_to_edge_pairs (db::CompoundRegionOperationNode &node, db::PropertyConstraint prop_constraint)
 {
   DeepEdgePairs *output = 0;
-  if (prop_constraint == db::IgnoreProperties) {
+  if (pc_skip (prop_constraint)) {
     output = region_cop_impl<db::EdgePair, DeepEdgePairs> (this, node);
   } else {
     output = region_cop_with_properties_impl<db::EdgePair, DeepEdgePairs> (this, node, prop_constraint);
@@ -1856,7 +1856,7 @@ RegionDelegate *
 DeepRegion::cop_to_region (db::CompoundRegionOperationNode &node, db::PropertyConstraint prop_constraint)
 {
   DeepRegion *output = 0;
-  if (prop_constraint == db::IgnoreProperties) {
+  if (pc_skip (prop_constraint)) {
     output = region_cop_impl<db::PolygonRef, db::DeepRegion> (this, node);
   } else {
     output = region_cop_with_properties_impl<db::PolygonRef, DeepRegion> (this, node, prop_constraint);
@@ -1872,7 +1872,7 @@ EdgesDelegate *
 DeepRegion::cop_to_edges (db::CompoundRegionOperationNode &node, db::PropertyConstraint prop_constraint)
 {
   DeepEdges *output = 0;
-  if (prop_constraint == db::IgnoreProperties) {
+  if (pc_skip (prop_constraint)) {
     output = region_cop_impl<db::Edge, DeepEdges> (this, node);
   } else {
     output = region_cop_with_properties_impl<db::Edge, DeepEdges> (this, node, prop_constraint);
@@ -1894,7 +1894,7 @@ DeepRegion::run_check (db::edge_relation_type rel, bool different_polygons, cons
   }
 
   //  force different polygons in the different properties case to skip intra-polygon checks
-  if (options.prop_constraint == DifferentPropertiesConstraint) {
+  if (pc_always_different (options.prop_constraint)) {
     different_polygons = true;
   }
 
@@ -2004,7 +2004,7 @@ DeepRegion::run_single_polygon_check (db::edge_relation_type rel, db::Coord d, c
 
     for (db::Shapes::shape_iterator s = shapes.begin (db::ShapeIterator::Polygons); ! s.at_end (); ++s) {
 
-      edge2edge_check_negative_or_positive<db::Shapes> edge_check (check, result, options.negative, false /*does not require different polygons*/, false /*does not require different layers*/, options.shielded, true /*symmetric edge pairs*/, options.prop_constraint == db::IgnoreProperties ? 0 : s->prop_id ());
+      edge2edge_check_negative_or_positive<db::Shapes> edge_check (check, result, options.negative, false /*does not require different polygons*/, false /*does not require different layers*/, options.shielded, true /*symmetric edge pairs*/, pc_remove (options.prop_constraint) ? 0 : s->prop_id ());
       poly2poly_check<db::Polygon> poly_check (edge_check);
 
       db::Polygon poly;
diff --git a/src/db/db/dbLocalOperationUtils.h b/src/db/db/dbLocalOperationUtils.h
index e18d975f8..77a813f2a 100644
--- a/src/db/db/dbLocalOperationUtils.h
+++ b/src/db/db/dbLocalOperationUtils.h
@@ -341,9 +341,8 @@ separate_interactions_by_properties (const shape_interactions<db::object_with_pr
     for (auto ii = i->second.begin (); ii != i->second.end (); ++ii) {
 
       const std::pair<unsigned int, db::object_with_properties<TI> > &intruder = interactions.intruder_shape (*ii);
-      db::properties_id_type intruder_prop_id = (property_constraint == db::NoPropertyConstraint ? prop_id : pmi (intruder.second.properties_id ()));
 
-      if ((property_constraint == db::DifferentPropertiesConstraint) == (prop_id != intruder_prop_id)) {
+      if (pc_match (property_constraint, prop_id, pmi (intruder.second.properties_id ()))) {
         s2p.second.insert (&intruder.second);
       }
 
@@ -382,9 +381,8 @@ separate_interactions_to_interactions_by_properties (const shape_interactions<db
 
       const std::pair<unsigned int, db::object_with_properties<TI> > &intruder = interactions.intruder_shape (*ii);
       tl_assert (intruder.first < (unsigned int) pmis.size ());
-      db::properties_id_type intruder_prop_id = (property_constraint == db::NoPropertyConstraint ? prop_id : pmis[intruder.first] (intruder.second.properties_id ()));
 
-      if ((property_constraint == db::DifferentPropertiesConstraint) == (prop_id != intruder_prop_id)) {
+      if (pc_match (property_constraint, prop_id, pmis[intruder.first] (intruder.second.properties_id ()))) {
         s2p.add_interaction (i->first, *ii);
         intruder_ids.insert (*ii);
       }
diff --git a/src/db/db/dbPropertyConstraint.h b/src/db/db/dbPropertyConstraint.h
index c4a19cc0a..b59a4f7a8 100644
--- a/src/db/db/dbPropertyConstraint.h
+++ b/src/db/db/dbPropertyConstraint.h
@@ -26,6 +26,7 @@
 #define HDR_dbPropertyConstraint
 
 #include "dbCommon.h"
+#include "dbTypes.h"
 
 namespace db
 {
@@ -56,14 +57,74 @@ enum PropertyConstraint
    */
   SamePropertiesConstraint = 2,
 
+  /**
+   *  @brief Shapes are processed if their properties are the same
+   *
+   *  No properties are attached to the output.
+   */
+  SamePropertiesConstraintDrop = 3,
+
   /**
    *  @brief Shapes are processed if their properties are different
    *
    *  Properties are attached to the outputs where applicable.
    */
-  DifferentPropertiesConstraint = 3
+  DifferentPropertiesConstraint = 4,
+
+  /**
+   *  @brief Shapes are processed if their properties are different
+   *
+   *  No properties are attached to the output.
+   */
+  DifferentPropertiesConstraintDrop = 5
 };
 
+/**
+ *  @brief Returns a predicate indicating whether properties need to be considered
+ */
+bool inline pc_skip (PropertyConstraint pc)
+{
+  return pc == IgnoreProperties;
+}
+
+/**
+ *  @brief Returns a predicate indicating whether properties are always different
+ */
+bool inline pc_always_different (PropertyConstraint pc)
+{
+  return pc == DifferentPropertiesConstraint || pc == DifferentPropertiesConstraintDrop;
+}
+
+/**
+ *  @brief Returns a value indicating whether two properties satisfy the condition
+ */
+bool inline pc_match (PropertyConstraint pc, db::properties_id_type a, db::properties_id_type b)
+{
+  if (pc == SamePropertiesConstraint || pc == SamePropertiesConstraintDrop) {
+    return a == b;
+  } else if (pc == DifferentPropertiesConstraint || pc == DifferentPropertiesConstraintDrop) {
+    return a != b;
+  } else {
+    return true;
+  }
+}
+
+/**
+ *  @brief Returns a value indicating whether the property can be removed on output
+ */
+bool inline pc_remove (PropertyConstraint pc)
+{
+  return pc == IgnoreProperties || pc == SamePropertiesConstraintDrop || pc == DifferentPropertiesConstraintDrop;
+}
+
+/**
+ *  @brief Returns a normalized property for output
+ */
+db::properties_id_type inline pc_norm (PropertyConstraint pc, db::properties_id_type prop_id)
+{
+  return pc_remove (pc) ? 0 : prop_id;
+}
+
 }
 
 #endif
diff --git a/src/db/db/dbRegionLocalOperations.cc b/src/db/db/dbRegionLocalOperations.cc
index 13a5ce031..aaaa73cf3 100644
--- a/src/db/db/dbRegionLocalOperations.cc
+++ b/src/db/db/dbRegionLocalOperations.cc
@@ -782,7 +782,7 @@ check_local_operation_with_properties<TS, TI>::do_compute_local (db::Layout *lay
     }
 
     for (auto r = result.begin (); r != result.end (); ++r) {
-      results.front ().insert (db::EdgePairWithProperties (*r, s2p->first));
+      results.front ().insert (db::EdgePairWithProperties (*r, pc_norm (check_local_operation_base<TS, TI>::m_options.prop_constraint, s2p->first)));
     }
 
   }
@@ -1668,8 +1668,7 @@ bool_and_or_not_local_operation_with_properties<TS, TI, TR>::do_compute_local (d
 
       for (auto j = i->second.begin (); j != i->second.end (); ++j) {
         const db::object_with_properties<TI> &intruder = interactions.intruder_shape (*j).second;
-        db::properties_id_type prop_id_i = (m_property_constraint != db::NoPropertyConstraint ? m_pmi (intruder.properties_id ()) : prop_id_s);
-        if ((prop_id_i != prop_id_s) == (m_property_constraint == db::DifferentPropertiesConstraint)) {
+        if (pc_match (m_property_constraint, prop_id_s, m_pmi (intruder.properties_id ()))) {
           shapes_by_prop.second.insert (intruder);
         }
       }
@@ -1684,7 +1683,7 @@ bool_and_or_not_local_operation_with_properties<TS, TI, TR>::do_compute_local (d
     size_t p1 = 0, p2 = 1;
 
     const std::set<TI> &others = p2s->second.second;
-    db::properties_id_type prop_id = p2s->first;
+    db::properties_id_type prop_id = pc_norm (m_property_constraint, p2s->first);
 
     for (auto s = p2s->second.first.begin (); s != p2s->second.first.end (); ++s) {
 
@@ -1857,8 +1856,7 @@ two_bool_and_not_local_operation_with_properties<TS, TI, TR>::do_compute_local (
 
       for (auto j = i->second.begin (); j != i->second.end (); ++j) {
         const db::object_with_properties<TI> &intruder = interactions.intruder_shape (*j).second;
-        db::properties_id_type prop_id_i = (m_property_constraint != db::NoPropertyConstraint ? m_pmi (intruder.properties_id ()) : prop_id_s);
-        if ((prop_id_i != prop_id_s) == (m_property_constraint == db::DifferentPropertiesConstraint)) {
+        if (pc_match (m_property_constraint, prop_id_s, m_pmi (intruder.properties_id ()))) {
           shapes_by_prop.second.insert (intruder);
         }
       }
@@ -1873,7 +1871,7 @@ two_bool_and_not_local_operation_with_properties<TS, TI, TR>::do_compute_local (
     size_t p1 = 0, p2 = 1;
 
     const std::set<TR> &others = p2s->second.second;
-    db::properties_id_type prop_id = p2s->first;
+    db::properties_id_type prop_id = pc_norm (m_property_constraint, p2s->first);
 
     for (auto s = p2s->second.first.begin (); s != p2s->second.first.end (); ++s) {
 
diff --git a/src/db/db/gsiDeclDbRegion.cc b/src/db/db/gsiDeclDbRegion.cc
index 04ad9ae04..6170da161 100644
--- a/src/db/db/gsiDeclDbRegion.cc
+++ b/src/db/db/gsiDeclDbRegion.cc
@@ -3172,10 +3172,20 @@ gsi::EnumIn<db::Region, db::PropertyConstraint> decl_Region_PropertyConstraint (
     "When using this constraint - for example on a boolean operation - shapes are considered "
     "only if their user properties are the same. Properties are generated on the output shapes where applicable."
   ) +
+  gsi::enum_const ("SamePropertiesConstraintDrop", db::SamePropertiesConstraintDrop,
+    "@brief Specifies to consider shapes only if their user properties are the same\n"
+    "When using this constraint - for example on a boolean operation - shapes are considered "
+    "only if their user properties are the same. No properties are generated on the output shapes."
+  ) +
   gsi::enum_const ("DifferentPropertiesConstraint", db::DifferentPropertiesConstraint,
     "@brief Specifies to consider shapes only if their user properties are different\n"
     "When using this constraint - for example on a boolean operation - shapes are considered "
     "only if their user properties are different. Properties are generated on the output shapes where applicable."
+  ) +
+  gsi::enum_const ("DifferentPropertiesConstraintDrop", db::DifferentPropertiesConstraintDrop,
+    "@brief Specifies to consider shapes only if their user properties are different\n"
+    "When using this constraint - for example on a boolean operation - shapes are considered "
+    "only if their user properties are the same. No properties are generated on the output shapes."
   ),
   "@brief This class represents the property constraint for boolean and check functions.\n"
   "\n"
diff --git a/src/drc/drc/built-in-macros/_drc_engine.rb b/src/drc/drc/built-in-macros/_drc_engine.rb
index 2c166ee4f..a5bd6286d 100644
--- a/src/drc/drc/built-in-macros/_drc_engine.rb
+++ b/src/drc/drc/built-in-macros/_drc_engine.rb
@@ -267,6 +267,13 @@ module DRC
     # 
     # m1m2_overlap_connected = metal1.nets.and(metal2, props_eq) 
     # @/code
+    # 
+    # "props_eq" can be combined with \props_copy. In this case, properties
+    # are transferred to the output shapes and can be used in further processing:
+    #
+    # @code
+    # m1m2_overlap_connected = metal1.nets.and(metal2, props_eq + props_copy) 
+    # @/code
     #
     # See also \props_ne.
 
@@ -291,6 +298,13 @@ module DRC
     # m1m2_overlap_not_connected = metal1.nets.and(metal2, props_ne)
     # @/code
     #
+    # "props_ne" can be combined with \props_copy. In this case, properties
+    # are transferred to the output shapes and can be used in further processing:
+    #
+    # @code
+    # m1m2_overlap_connected = metal1.nets.and(metal2, props_ne + props_copy) 
+    # @/code
+    #
     # See also \props_eq.
 
     # %DRC%
diff --git a/src/drc/drc/built-in-macros/_drc_layer.rb b/src/drc/drc/built-in-macros/_drc_layer.rb
index 2ff441a03..0747afedf 100644
--- a/src/drc/drc/built-in-macros/_drc_layer.rb
+++ b/src/drc/drc/built-in-macros/_drc_layer.rb
@@ -3781,10 +3781,17 @@ CODE
     # @code
     #
     # \props_copy is a special properties constraint that does not alter the behaviour of
-    # the checks, but copies the primary shape's properties to the output markers
-    # (a behaviour that is implied by \props_eq and \props_ne, but not there by default).
+    # the checks, but copies the primary shape's properties to the output markers.
     # This constraint is applicable to \width and \notch checks too. The effect is that
     # the original polygon's properties are copied to the error markers.
+    # \props_copy can be combined with \props_eq and \props_ne to copy the original
+    # shape's properties to the output too:
+    #
+    # @code
+    # space_not_connected = metal1_nets.space(0.4.um, props_ne + props_copy)
+    # space_connected     = metal1_nets.space(0.4.um, props_eq + props_copy)
+    # @code
+    #
     
     # %DRC%
     # @name space
diff --git a/src/drc/drc/built-in-macros/_drc_tags.rb b/src/drc/drc/built-in-macros/_drc_tags.rb
index aabb84c52..495f458d1 100644
--- a/src/drc/drc/built-in-macros/_drc_tags.rb
+++ b/src/drc/drc/built-in-macros/_drc_tags.rb
@@ -151,6 +151,30 @@ module DRC
     def initialize(v)
       self.value = v
     end
+    def is_eq?
+      self.value == RBA::Region::SamePropertiesConstraint || self.value == RBA::Region::SamePropertiesConstraintDrop
+    end
+    def is_ne?
+      self.value == RBA::Region::DifferentPropertiesConstraint || self.value == RBA::Region::DifferentPropertiesConstraintDrop
+    end
+    def is_copy?
+      self.value == RBA::Region::NoPropertyConstraint || self.value == RBA::Region::SamePropertiesConstraint || self.value == RBA::Region::DifferentPropertiesConstraint
+    end
+    def +(other)
+      other.is_a?(DRCPropertiesConstraint) || raise("'+' needs to be applied to two properties constraints (got #{other.inspect} for the second one)")
+      is_eq = self.is_eq? || other.is_eq? 
+      is_ne = self.is_ne? || other.is_ne? 
+      is_copy = self.is_copy? || other.is_copy? 
+      if is_eq == is_ne
+        DRCPropertiesConstraint::new(is_copy ? RBA::Region::NoPropertyConstraint : RBA::Region::IgnoreProperties)
+      elsif is_eq
+        DRCPropertiesConstraint::new(is_copy ? RBA::Region::SamePropertiesConstraint : RBA::Region::SamePropertiesConstraintDrop)
+      elsif is_ne
+        DRCPropertiesConstraint::new(is_copy ? RBA::Region::DifferentPropertiesConstraint : RBA::Region::DifferentPropertiesConstraintDrop)
+      else
+        nil
+      end
+    end
   end
   
   # Negative output on checks
diff --git a/testdata/drc/drcSimpleTests_70.drc b/testdata/drc/drcSimpleTests_70.drc
index 28c67a740..860fe612c 100644
--- a/testdata/drc/drcSimpleTests_70.drc
+++ b/testdata/drc/drcSimpleTests_70.drc
@@ -40,15 +40,15 @@ l4_wp.output(16, 0)
 
 # booleans with properties constraints
 
-l3_wp.and(l4_wp, props_eq).output(20, 0)
-l3_wp1.and(l4_wp, props_eq).output(21, 0)
-l3_wp2as1.and(l4_wp, props_eq).output(22, 0)
-l3_nowp.and(l4_wp, props_eq).output(23, 0)
+l3_wp.and(l4_wp, props_eq + props_copy).output(20, 0)
+l3_wp1.and(l4_wp, props_eq + props_copy).output(21, 0)
+l3_wp2as1.and(l4_wp, props_eq + props_copy).output(22, 0)
+l3_nowp.and(l4_wp, props_eq + props_copy).output(23, 0)
 
-l3_wp.and(l4_wp, props_ne).output(30, 0)
-l3_wp1.and(l4_wp, props_ne).output(31, 0)
-l3_wp2as1.and(l4_wp, props_ne).output(32, 0)
-l3_nowp.and(l4_wp, props_ne).output(33, 0)
+l3_wp.and(l4_wp, props_ne + props_copy).output(30, 0)
+l3_wp1.and(l4_wp, props_ne + props_copy).output(31, 0)
+l3_wp2as1.and(l4_wp, props_ne + props_copy).output(32, 0)
+l3_nowp.and(l4_wp, props_ne + props_copy).output(33, 0)
 
 l3_wp.and(l4_wp, props_copy).output(40, 0)
 l3_wp1.and(l4_wp, props_copy).output(41, 0)
@@ -79,15 +79,15 @@ l1.nets("NOTEXIST", "NOTEXIST").output(113, 0)
 l1_nets = l1.nets
 
 l1_nets.space(1.0.um, projection).polygons.output(200, 0)
-l1_nets.space(1.0.um, projection, props_eq).polygons.output(201, 0)
-l1_nets.space(1.0.um, projection, props_ne).polygons.output(202, 0)
+l1_nets.space(1.0.um, projection, props_eq + props_copy).polygons.output(201, 0)
+l1_nets.space(1.0.um, projection, props_ne + props_copy).polygons.output(202, 0)
 l1_nets.space(1.0.um, projection, props_copy).polygons.output(203, 0)
 l1_nets.width(1.0.um, projection).polygons.output(204, 0)
 l1_nets.width(1.0.um, projection, props_copy).polygons.output(205, 0)
 
 l1_nets.drc(space(projection) < 1.0.um).polygons.output(210, 0)
-l1_nets.drc(space(projection) < 1.0.um, props_eq).polygons.output(211, 0)
-l1_nets.drc(space(projection) < 1.0.um, props_ne).polygons.output(212, 0)
+l1_nets.drc(space(projection) < 1.0.um, props_eq + props_copy).polygons.output(211, 0)
+l1_nets.drc(space(projection) < 1.0.um, props_ne + props_copy).polygons.output(212, 0)
 l1_nets.drc(space(projection) < 1.0.um, props_copy).polygons.output(213, 0)
 l1_nets.drc(width(projection) < 1.0.um).polygons.output(214, 0)
 l1_nets.drc(width(projection) < 1.0.um, props_copy).polygons.output(215, 0)
@@ -103,10 +103,10 @@ l1_nets.space(1.0.um, projection, props_copy).edges.extended_in(10.nm).output(22
 # sizing with properties
 
 l1_nets_sized = l1_nets.sized(0.2.um)
-l1_nets_sized.and(l1_nets_sized, props_ne).output(300, 0)   # overlap of different nets, same layer
+l1_nets_sized.and(l1_nets_sized, props_ne + props_copy).output(300, 0)   # overlap of different nets, same layer
 
 l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um)).output(310, 0)
-l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um), props_ne).output(311, 0)
-l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um), props_eq).output(312, 0)
+l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um), props_ne + props_copy).output(311, 0)
+l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um), props_eq + props_copy).output(312, 0)
 l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um), props_copy).output(313, 0)