diff --git a/AnimatedGif.xcodeproj/project.pbxproj b/AnimatedGif.xcodeproj/project.pbxproj
index f1779a1..aaa6739 100644
--- a/AnimatedGif.xcodeproj/project.pbxproj
+++ b/AnimatedGif.xcodeproj/project.pbxproj
@@ -7,6 +7,8 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		CC1777EB20A1E8C40043C210 /* LICENSE.md in Sources */ = {isa = PBXBuildFile; fileRef = CC1777E920A1E7DF0043C210 /* LICENSE.md */; };
+		CC1777EC20A1E95D0043C210 /* LICENSE.md in Resources */ = {isa = PBXBuildFile; fileRef = CC1777E920A1E7DF0043C210 /* LICENSE.md */; };
 		CC24BA9B1BF124350045BDC7 /* AnimatedGifView.h in Headers */ = {isa = PBXBuildFile; fileRef = CC24BA9A1BF124350045BDC7 /* AnimatedGifView.h */; };
 		CC24BA9D1BF124350045BDC7 /* AnimatedGifView.m in Sources */ = {isa = PBXBuildFile; fileRef = CC24BA9C1BF124350045BDC7 /* AnimatedGifView.m */; };
 		CC4486F21C8A3A50008520D2 /* thumbnail.png in Resources */ = {isa = PBXBuildFile; fileRef = CC4486F01C8A3A50008520D2 /* thumbnail.png */; };
@@ -16,6 +18,7 @@
 
 /* Begin PBXFileReference section */
 		CC1073C41C78947900AC5F63 /* es */ = {isa = PBXFileReference; lastKnownFileType = file.xib; name = es; path = es.lproj/Options.xib; sourceTree = "<group>"; };
+		CC1777E920A1E7DF0043C210 /* LICENSE.md */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = net.daringfireball.markdown; path = LICENSE.md; sourceTree = SOURCE_ROOT; };
 		CC24BA951BF124350045BDC7 /* AnimatedGif.saver */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = AnimatedGif.saver; sourceTree = BUILT_PRODUCTS_DIR; };
 		CC24BA991BF124350045BDC7 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		CC24BA9A1BF124350045BDC7 /* AnimatedGifView.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AnimatedGifView.h; sourceTree = "<group>"; };
@@ -68,6 +71,7 @@
 		CC24BA981BF124350045BDC7 /* Supporting Files */ = {
 			isa = PBXGroup;
 			children = (
+				CC1777E920A1E7DF0043C210 /* LICENSE.md */,
 				CC4486F01C8A3A50008520D2 /* thumbnail.png */,
 				CC4486F11C8A3A50008520D2 /* thumbnail@2x.png */,
 				CC24BA991BF124350045BDC7 /* Info.plist */,
@@ -146,6 +150,7 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				CC1777EC20A1E95D0043C210 /* LICENSE.md in Resources */,
 				CC4486F21C8A3A50008520D2 /* thumbnail.png in Resources */,
 				CCC3B9991C788F8E00FBE423 /* Options.xib in Resources */,
 				CC4486F31C8A3A50008520D2 /* thumbnail@2x.png in Resources */,
@@ -159,6 +164,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				CC1777EB20A1E8C40043C210 /* LICENSE.md in Sources */,
 				CC24BA9D1BF124350045BDC7 /* AnimatedGifView.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/AnimatedGif/AnimatedGifView.h b/AnimatedGif/AnimatedGifView.h
index 005d448..2d930db 100644
--- a/AnimatedGif/AnimatedGifView.h
+++ b/AnimatedGif/AnimatedGifView.h
@@ -32,6 +32,7 @@
 #define DEFAULT_ANIME_TIME_INTER    1/15.0
 #define GL_ALPHA_OPAQUE             1.0f
 #define NS_ALPHA_OPAQUE             1.0
+#define NEVER_CHANGE_GIF            30
 
 
 @interface AnimatedGifView : ScreenSaverView {
diff --git a/AnimatedGif/AnimatedGifView.m b/AnimatedGif/AnimatedGifView.m
index e2dbaf3..5a28c4a 100644
--- a/AnimatedGif/AnimatedGifView.m
+++ b/AnimatedGif/AnimatedGifView.m
@@ -174,7 +174,7 @@ - (void)startAnimation
     backgrRed = [defaults floatForKey:@"BackgrRed"];
     backgrGreen = [defaults floatForKey:@"BackgrGreen"];
     backgrBlue = [defaults floatForKey:@"BackgrBlue"];
-    NSInteger changeIntervalInSec = [defaults integerForKey:@"ChangeInterval"] * 60;
+    NSInteger changeIntervalInMin = [defaults integerForKey:@"ChangeInterval"];
     
     // select a random file from directory or keep the file if it was already a file
     NSString *newGifFileName = [self getRandomGifFile:gifFileName];
@@ -196,11 +196,11 @@ - (void)startAnimation
     filter = filterOption;
     
     // check if it is a file or a directory
-    if ([self isDir:gifFileName])
+    if ([self isDir:gifFileName] && ((changeIntervalInMin) != NEVER_CHANGE_GIF))
     {
 
         // start a one-time timer at end of startAnimation otherwise the time for loading the GIF is part of the timer
-        [NSTimer scheduledTimerWithTimeInterval:changeIntervalInSec
+        [NSTimer scheduledTimerWithTimeInterval:(changeIntervalInMin * 60)
                                          target:self
                                        selector:@selector(timerMethod)
                                        userInfo:nil
@@ -507,7 +507,14 @@ - (NSWindow*)configureSheet
     [self.popupButtonViewOptions selectItemWithTag:viewOpt];
     [self.popupButtonFilterOptions selectItemWithTag:filterOpt];
     [self.sliderChangeInterval setIntegerValue:changeInter];
-    [self.labelChangeInterval setStringValue:[self.sliderChangeInterval stringValue]];
+    if ([self.sliderChangeInterval intValue] == NEVER_CHANGE_GIF)
+    {
+        [self.labelChangeInterval setStringValue:[self.labelChIntT4 stringValue]];
+    }
+    else
+    {
+        [self.labelChangeInterval setStringValue:[self.sliderChangeInterval stringValue]];
+    }
     [self enableSliderFpsManual:frameRateManual];
     [self.labelFpsManual setStringValue:[self.sliderFpsManual stringValue]];
     [self.colorWellBackgrColor setColor:[NSColor colorWithRed:bgrRed green:bgrGreen blue:bgrBlue alpha:NS_ALPHA_OPAQUE]];
@@ -663,7 +670,14 @@ - (IBAction)selectSliderFpsManual:(id)sender
 - (IBAction)selectSliderChangeInterval:(id)sender
 {
     // update label with actual selected value of slider
-    [self.labelChangeInterval setStringValue:[self.sliderChangeInterval stringValue]];
+    if ([self.sliderChangeInterval intValue] == NEVER_CHANGE_GIF)
+    {
+        [self.labelChangeInterval setStringValue:[self.labelChIntT4 stringValue]];
+    }
+    else
+    {
+        [self.labelChangeInterval setStringValue:[self.sliderChangeInterval stringValue]];
+    }
 }
 
 - (void)enableSliderChangeInterval:(BOOL)enable
diff --git a/AnimatedGif/Info.plist b/AnimatedGif/Info.plist
index 54fa76b..826db40 100644
--- a/AnimatedGif/Info.plist
+++ b/AnimatedGif/Info.plist
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>BNDL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.3.7</string>
+	<string>1.3.8</string>
 	<key>CFBundleSignature</key>
 	<string>com.waitsnake.animatedgif</string>
 	<key>CFBundleVersion</key>
diff --git a/AnimatedGif/de.lproj/Options.xib b/AnimatedGif/de.lproj/Options.xib
index c24f075..89a3fc3 100644
--- a/AnimatedGif/de.lproj/Options.xib
+++ b/AnimatedGif/de.lproj/Options.xib
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="10117" systemVersion="15G19009" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="10117" systemVersion="15G20015" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
     <dependencies>
         <deployment identifier="macosx"/>
         <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="10117"/>
@@ -186,14 +186,6 @@
                             <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
                         </textFieldCell>
                     </textField>
-                    <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="sTK-sE-oMf">
-                        <rect key="frame" x="445" y="225" width="21" height="17"/>
-                        <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="30" id="hzM-Wj-pPC">
-                            <font key="font" metaFont="system"/>
-                            <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
-                            <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
-                        </textFieldCell>
-                    </textField>
                     <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="z6q-HR-xMt">
                         <rect key="frame" x="424" y="279" width="43" height="17"/>
                         <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" alignment="center" title="5" id="lJ1-KY-AED">
@@ -332,6 +324,14 @@ DQ
                             </menu>
                         </popUpButtonCell>
                     </popUpButton>
+                    <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="sTK-sE-oMf">
+                        <rect key="frame" x="442" y="225" width="25" height="17"/>
+                        <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Nie" id="hzM-Wj-pPC">
+                            <font key="font" metaFont="system"/>
+                            <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
+                            <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
+                        </textFieldCell>
+                    </textField>
                 </subviews>
             </view>
             <connections>
diff --git a/AnimatedGif/en.lproj/Options.xib b/AnimatedGif/en.lproj/Options.xib
index cd40b0f..d5d4a5b 100644
--- a/AnimatedGif/en.lproj/Options.xib
+++ b/AnimatedGif/en.lproj/Options.xib
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="10117" systemVersion="15G19009" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="10117" systemVersion="15G20015" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
     <dependencies>
         <deployment identifier="macosx"/>
         <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="10117"/>
@@ -198,14 +198,6 @@ Gw
                             <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
                         </textFieldCell>
                     </textField>
-                    <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="iDH-TQ-qwC">
-                        <rect key="frame" x="443" y="225" width="21" height="17"/>
-                        <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="30" id="ZpP-6P-mSC">
-                            <font key="font" metaFont="system"/>
-                            <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
-                            <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
-                        </textFieldCell>
-                    </textField>
                     <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="3Ki-Bh-6dB">
                         <rect key="frame" x="424" y="279" width="43" height="17"/>
                         <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" alignment="center" title="5" id="7H6-sp-V6n">
@@ -332,6 +324,14 @@ Gw
                             </menu>
                         </popUpButtonCell>
                     </popUpButton>
+                    <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="iDH-TQ-qwC">
+                        <rect key="frame" x="427" y="225" width="40" height="17"/>
+                        <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Never" id="ZpP-6P-mSC">
+                            <font key="font" metaFont="system"/>
+                            <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
+                            <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
+                        </textFieldCell>
+                    </textField>
                 </subviews>
             </view>
             <connections>
diff --git a/AnimatedGif/es.lproj/Options.xib b/AnimatedGif/es.lproj/Options.xib
index 355f3b9..9e4420c 100644
--- a/AnimatedGif/es.lproj/Options.xib
+++ b/AnimatedGif/es.lproj/Options.xib
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="10117" systemVersion="15G19009" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="10117" systemVersion="15G20015" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
     <dependencies>
         <deployment identifier="macosx"/>
         <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="10117"/>
@@ -197,14 +197,6 @@ Gw
                             <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
                         </textFieldCell>
                     </textField>
-                    <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="toF-ZN-R9v">
-                        <rect key="frame" x="446" y="219" width="21" height="17"/>
-                        <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="30" id="ba0-kp-sOh">
-                            <font key="font" metaFont="system"/>
-                            <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
-                            <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
-                        </textFieldCell>
-                    </textField>
                     <slider verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="GKf-lt-8W8">
                         <rect key="frame" x="18" y="329" width="446" height="27"/>
                         <sliderCell key="cell" enabled="NO" alignment="left" minValue="1" maxValue="60" doubleValue="30" tickMarkPosition="below" numberOfTickMarks="60" allowsTickMarkValuesOnly="YES" sliderType="linear" id="ATX-YZ-Fff"/>
@@ -332,6 +324,14 @@ Gw
                             <action selector="navigateSegmentButton:" target="-2" id="bCA-Fa-VYE"/>
                         </connections>
                     </segmentedControl>
+                    <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="toF-ZN-R9v">
+                        <rect key="frame" x="425" y="219" width="43" height="17"/>
+                        <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Nunca" id="ba0-kp-sOh">
+                            <font key="font" metaFont="system"/>
+                            <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
+                            <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
+                        </textFieldCell>
+                    </textField>
                 </subviews>
             </view>
             <connections>
diff --git a/AnimatedGif/ja.lproj/Options.xib b/AnimatedGif/ja.lproj/Options.xib
index cde55bd..bc67fc0 100644
--- a/AnimatedGif/ja.lproj/Options.xib
+++ b/AnimatedGif/ja.lproj/Options.xib
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="10117" systemVersion="15G19009" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="10117" systemVersion="15G20015" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
     <dependencies>
         <deployment identifier="macosx"/>
         <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="10117"/>
@@ -202,14 +202,6 @@ Gw
                             <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
                         </textFieldCell>
                     </textField>
-                    <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="iDH-TQ-qwC">
-                        <rect key="frame" x="470" y="225" width="21" height="17"/>
-                        <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="30" id="ZpP-6P-mSC">
-                            <font key="font" metaFont="system"/>
-                            <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
-                            <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
-                        </textFieldCell>
-                    </textField>
                     <slider verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="GKf-lt-8W8">
                         <rect key="frame" x="18" y="331" width="473" height="27"/>
                         <sliderCell key="cell" enabled="NO" alignment="left" minValue="1" maxValue="60" doubleValue="30" tickMarkPosition="below" numberOfTickMarks="60" allowsTickMarkValuesOnly="YES" sliderType="linear" id="ATX-YZ-Fff"/>
@@ -332,6 +324,14 @@ Gw
                         <rect key="frame" x="127" y="185" width="44" height="23"/>
                         <color key="color" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                     </colorWell>
+                    <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="iDH-TQ-qwC">
+                        <rect key="frame" x="450" y="225" width="41" height="17"/>
+                        <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="決して" id="ZpP-6P-mSC">
+                            <font key="font" size="13" name=".HiraKakuInterface-W3"/>
+                            <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
+                            <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
+                        </textFieldCell>
+                    </textField>
                 </subviews>
             </view>
             <connections>
diff --git a/Release/AnimatedGif.saver.zip b/Release/AnimatedGif.saver.zip
index 9cc7f2a..e26c3d8 100644
Binary files a/Release/AnimatedGif.saver.zip and b/Release/AnimatedGif.saver.zip differ