diff --git a/DigitalPlatform.LibraryClient/DigitalPlatform.LibraryClient.csproj b/DigitalPlatform.LibraryClient/DigitalPlatform.LibraryClient.csproj
index c51b2387..14d15111 100644
--- a/DigitalPlatform.LibraryClient/DigitalPlatform.LibraryClient.csproj
+++ b/DigitalPlatform.LibraryClient/DigitalPlatform.LibraryClient.csproj
@@ -36,8 +36,8 @@
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="log4net, Version=2.0.12.0, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a, processorArchitecture=MSIL">
-      <HintPath>..\packages\log4net.2.0.12\lib\net45\log4net.dll</HintPath>
+    <Reference Include="log4net, Version=2.0.14.0, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a, processorArchitecture=MSIL">
+      <HintPath>..\packages\log4net.2.0.14\lib\net45\log4net.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Configuration" />
diff --git a/DigitalPlatform.LibraryClient/packages.config b/DigitalPlatform.LibraryClient/packages.config
index 2d060118..99ad1adc 100644
--- a/DigitalPlatform.LibraryClient/packages.config
+++ b/DigitalPlatform.LibraryClient/packages.config
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="log4net" version="2.0.12" targetFramework="net461" />
+  <package id="log4net" version="2.0.14" targetFramework="net472" />
 </packages>
\ No newline at end of file
diff --git a/DigitalPlatform.SIP.Server/DigitalPlatform.SIP.Server.csproj b/DigitalPlatform.SIP.Server/DigitalPlatform.SIP.Server.csproj
index 5e6d2d10..1372b017 100644
--- a/DigitalPlatform.SIP.Server/DigitalPlatform.SIP.Server.csproj
+++ b/DigitalPlatform.SIP.Server/DigitalPlatform.SIP.Server.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.12" />
+    <PackageReference Include="log4net" Version="2.0.14" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/DigitalPlatform.Text/Cryptography.cs b/DigitalPlatform.Text/Cryptography.cs
index cda14f18..0807a9e2 100644
--- a/DigitalPlatform.Text/Cryptography.cs
+++ b/DigitalPlatform.Text/Cryptography.cs
@@ -7,6 +7,7 @@
 
 namespace DigitalPlatform.Text
 {
+#if REMOVED
     /// <summary>
     /// 和加密有关的函数
     /// </summary>
@@ -93,4 +94,5 @@ public static string Decrypt(string strSource, string strKey)
         }
     }
 
+#endif
 }
diff --git a/DigitalPlatform.Z3950.Server/DigitalPlatform.Z3950.Server.csproj b/DigitalPlatform.Z3950.Server/DigitalPlatform.Z3950.Server.csproj
index be2b6cc8..80cdb76c 100644
--- a/DigitalPlatform.Z3950.Server/DigitalPlatform.Z3950.Server.csproj
+++ b/DigitalPlatform.Z3950.Server/DigitalPlatform.Z3950.Server.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.12" />
+    <PackageReference Include="log4net" Version="2.0.14" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="System.Buffers" Version="4.5.1" />
   </ItemGroup>
diff --git a/dp2Capo/dp2Capo.csproj b/dp2Capo/dp2Capo.csproj
index 8dbbf3f8..1654f5bc 100644
--- a/dp2Capo/dp2Capo.csproj
+++ b/dp2Capo/dp2Capo.csproj
@@ -38,8 +38,8 @@
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="log4net, Version=2.0.12.0, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a, processorArchitecture=MSIL">
-      <HintPath>..\packages\log4net.2.0.12\lib\net45\log4net.dll</HintPath>
+    <Reference Include="log4net, Version=2.0.14.0, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a, processorArchitecture=MSIL">
+      <HintPath>..\packages\log4net.2.0.14\lib\net45\log4net.dll</HintPath>
     </Reference>
     <Reference Include="Microsoft.AspNet.SignalR.Client, Version=2.4.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <HintPath>..\packages\Microsoft.AspNet.SignalR.Client.2.4.1\lib\net45\Microsoft.AspNet.SignalR.Client.dll</HintPath>
diff --git a/dp2Capo/packages.config b/dp2Capo/packages.config
index f7662c37..7ea21a93 100644
--- a/dp2Capo/packages.config
+++ b/dp2Capo/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="log4net" version="2.0.12" targetFramework="net461" />
+  <package id="log4net" version="2.0.14" targetFramework="net472" />
   <package id="Microsoft.AspNet.SignalR.Client" version="2.4.1" targetFramework="net461" />
   <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net472" />
   <package id="System.Buffers" version="4.5.1" targetFramework="net461" />
diff --git a/dp2Router/dp2Router.csproj b/dp2Router/dp2Router.csproj
index 7bc5e321..de1b508d 100644
--- a/dp2Router/dp2Router.csproj
+++ b/dp2Router/dp2Router.csproj
@@ -38,8 +38,8 @@
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="log4net, Version=2.0.12.0, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a, processorArchitecture=MSIL">
-      <HintPath>..\packages\log4net.2.0.12\lib\net45\log4net.dll</HintPath>
+    <Reference Include="log4net, Version=2.0.14.0, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a, processorArchitecture=MSIL">
+      <HintPath>..\packages\log4net.2.0.14\lib\net45\log4net.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Configuration" />
diff --git a/dp2Router/packages.config b/dp2Router/packages.config
index 2d060118..99ad1adc 100644
--- a/dp2Router/packages.config
+++ b/dp2Router/packages.config
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="log4net" version="2.0.12" targetFramework="net461" />
+  <package id="log4net" version="2.0.14" targetFramework="net472" />
 </packages>
\ No newline at end of file
diff --git a/dp2SIPClient/dp2SIPClient.csproj b/dp2SIPClient/dp2SIPClient.csproj
index b6a579fb..36d20e99 100644
--- a/dp2SIPClient/dp2SIPClient.csproj
+++ b/dp2SIPClient/dp2SIPClient.csproj
@@ -77,8 +77,8 @@
     <ManifestTimestampUrl>http://timestamp.digicert.com</ManifestTimestampUrl>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="log4net, Version=2.0.15.0, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a, processorArchitecture=MSIL">
-      <HintPath>..\packages\log4net.2.0.15\lib\net45\log4net.dll</HintPath>
+    <Reference Include="log4net, Version=2.0.14.0, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a, processorArchitecture=MSIL">
+      <HintPath>..\packages\log4net.2.0.14\lib\net45\log4net.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Configuration" />
diff --git a/dp2SIPClient/packages.config b/dp2SIPClient/packages.config
index 4da49bf2..99ad1adc 100644
--- a/dp2SIPClient/packages.config
+++ b/dp2SIPClient/packages.config
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="log4net" version="2.0.15" targetFramework="net472" />
+  <package id="log4net" version="2.0.14" targetFramework="net472" />
 </packages>
\ No newline at end of file