diff --git a/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/AbstractDocumentBuilder.java b/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/AbstractDocumentBuilder.java
index 1ab13ee2d059c960f75d672d69f1d3fabfa09aac..c16ce44b1fd0002ebff4eecf5a21bb38d1187479 100644
--- a/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/AbstractDocumentBuilder.java
+++ b/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/AbstractDocumentBuilder.java
@@ -16,7 +16,7 @@ import de.tudresden.inf.mci.brailleplot.printabledata.MatrixData;
  * @version 28.05.2019
  */
 
-public abstract class AbstractDocumentBuilder<T> {
+abstract class AbstractDocumentBuilder<T> {
 
     MatrixData<T> mData;
 
diff --git a/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/AbstractIndexV4Builder.java b/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/AbstractIndexV4Builder.java
index 9c5df87cfb09bb4e3ebdac89a880944e072dca82..b79ba6a7bd627ac0db6f1adb17ecf564ad7b1c7b 100644
--- a/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/AbstractIndexV4Builder.java
+++ b/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/AbstractIndexV4Builder.java
@@ -11,7 +11,7 @@ package de.tudresden.inf.mci.brailleplot.printerbackend;
  */
 
 @SuppressWarnings("checkstyle:MagicNumber")
-public abstract class AbstractIndexV4Builder extends AbstractDocumentBuilder {
+abstract class AbstractIndexV4Builder extends AbstractDocumentBuilder {
 
 
 
diff --git a/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/FloatingDotAreaBuilder.java b/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/FloatingDotAreaBuilder.java
index 354f5937922803b92f8c4e005645cca2dba19372..b16826be2e92e2ace441eafc47927548f932a5f1 100644
--- a/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/FloatingDotAreaBuilder.java
+++ b/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/FloatingDotAreaBuilder.java
@@ -10,7 +10,7 @@ import de.tudresden.inf.mci.brailleplot.printabledata.MatrixData;
  * @version 29.05.2019
  */
 
-public class FloatingDotAreaBuilder extends AbstractIndexV4Builder {
+class FloatingDotAreaBuilder extends AbstractIndexV4Builder {
 
     /**
      * Constructor. Does not have any functionality. Should only be used in  {@link PrintDirector}
diff --git a/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/GraphicPrintBuilder.java b/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/GraphicPrintBuilder.java
index f172025559537c3e906d87b14eb1f024bdb5d7c5..a51107b5ca0fa00cee02ff52dc7ef6038d187afd 100644
--- a/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/GraphicPrintBuilder.java
+++ b/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/GraphicPrintBuilder.java
@@ -7,7 +7,7 @@ import de.tudresden.inf.mci.brailleplot.printabledata.MatrixData;
  * Class representing the graphic mode protocol from braille Index Everest D4.
  * @author Andrey Ruzhanskiy
  */
-public class GraphicPrintBuilder extends AbstractIndexV4Builder {
+class GraphicPrintBuilder extends AbstractIndexV4Builder {
 
     /**
      * Constructor. Does not have any functionality. Should only be used in  {@link PrintDirector}
diff --git a/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/NormalBuilder.java b/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/NormalBuilder.java
index e93dbca24ba0d39b37563232a19ccfaead411190..f33d1060dc507e74111463b67bd1160177fa6781 100644
--- a/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/NormalBuilder.java
+++ b/src/main/java/de/tudresden/inf/mci/brailleplot/printerbackend/NormalBuilder.java
@@ -15,7 +15,7 @@ import java.util.Objects;
  * @version 12.07.2019
  */
 @SuppressWarnings("checkstyle:MagicNumber")
-public class NormalBuilder extends AbstractDocumentBuilder<Boolean> {
+class NormalBuilder extends AbstractDocumentBuilder<Boolean> {
 
 
     /**