diff --git a/app/src/main/java/org/schabi/newpipe/about/LicenseFragmentHelper.kt b/app/src/main/java/org/schabi/newpipe/about/LicenseFragmentHelper.kt
index c1dd38389..3acb50cb9 100644
--- a/app/src/main/java/org/schabi/newpipe/about/LicenseFragmentHelper.kt
+++ b/app/src/main/java/org/schabi/newpipe/about/LicenseFragmentHelper.kt
@@ -12,10 +12,7 @@ import org.schabi.newpipe.R
 import org.schabi.newpipe.util.Localization
 import org.schabi.newpipe.util.ThemeHelper
 import org.schabi.newpipe.util.external_communication.ShareUtils
-import java.io.BufferedReader
 import java.io.IOException
-import java.io.InputStreamReader
-import java.nio.charset.StandardCharsets
 
 object LicenseFragmentHelper {
     /**
@@ -25,32 +22,13 @@ object LicenseFragmentHelper {
      * styled according to the context's theme
      */
     private fun getFormattedLicense(context: Context, license: License): String {
-        val licenseContent = StringBuilder()
-        val webViewData: String
         try {
-            BufferedReader(
-                InputStreamReader(
-                    context.assets.open(license.filename),
-                    StandardCharsets.UTF_8
-                )
-            ).use { `in` ->
-                var str: String?
-                while (`in`.readLine().also { str = it } != null) {
-                    licenseContent.append(str)
-                }
-
+            return context.assets.open(license.filename).bufferedReader().use { it.readText() }
                 // split the HTML file and insert the stylesheet into the HEAD of the file
-                webViewData = "$licenseContent".replace(
-                    "</head>",
-                    "<style>" + getLicenseStylesheet(context) + "</style></head>"
-                )
-            }
+                .replace("</head>", "<style>${getLicenseStylesheet(context)}</style></head>")
         } catch (e: IOException) {
-            throw IllegalArgumentException(
-                "Could not get license file: " + license.filename, e
-            )
+            throw IllegalArgumentException("Could not get license file: ${license.filename}", e)
         }
-        return webViewData
     }
 
     /**
@@ -118,9 +96,7 @@ object LicenseFragmentHelper {
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe { formattedLicense ->
-                    val webViewData = Base64.encodeToString(
-                        formattedLicense.toByteArray(StandardCharsets.UTF_8), Base64.NO_PADDING
-                    )
+                    val webViewData = Base64.encodeToString(formattedLicense.toByteArray(), Base64.NO_PADDING)
                     val webView = WebView(context)
                     webView.loadData(webViewData, "text/html; charset=UTF-8", "base64")
 
diff --git a/app/src/main/java/org/schabi/newpipe/settings/ContentSettingsManager.kt b/app/src/main/java/org/schabi/newpipe/settings/ContentSettingsManager.kt
index 3ac275695..8adf6a649 100644
--- a/app/src/main/java/org/schabi/newpipe/settings/ContentSettingsManager.kt
+++ b/app/src/main/java/org/schabi/newpipe/settings/ContentSettingsManager.kt
@@ -5,9 +5,6 @@ import android.util.Log
 import org.schabi.newpipe.streams.io.SharpOutputStream
 import org.schabi.newpipe.streams.io.StoredFileHelper
 import org.schabi.newpipe.util.ZipHelper
-import java.io.BufferedOutputStream
-import java.io.FileInputStream
-import java.io.FileOutputStream
 import java.io.IOException
 import java.io.ObjectInputStream
 import java.io.ObjectOutputStream
@@ -25,12 +22,12 @@ class ContentSettingsManager(private val fileLocator: NewPipeFileLocator) {
     @Throws(Exception::class)
     fun exportDatabase(preferences: SharedPreferences, file: StoredFileHelper) {
         file.create()
-        ZipOutputStream(BufferedOutputStream(SharpOutputStream(file.stream)))
+        ZipOutputStream(SharpOutputStream(file.stream).buffered())
             .use { outZip ->
                 ZipHelper.addFileToZip(outZip, fileLocator.db.path, "newpipe.db")
 
                 try {
-                    ObjectOutputStream(FileOutputStream(fileLocator.settings)).use { output ->
+                    ObjectOutputStream(fileLocator.settings.outputStream()).use { output ->
                         output.writeObject(preferences.all)
                         output.flush()
                     }
@@ -74,7 +71,7 @@ class ContentSettingsManager(private val fileLocator: NewPipeFileLocator) {
         try {
             val preferenceEditor = preferences.edit()
 
-            ObjectInputStream(FileInputStream(fileLocator.settings)).use { input ->
+            ObjectInputStream(fileLocator.settings.inputStream()).use { input ->
                 preferenceEditor.clear()
                 @Suppress("UNCHECKED_CAST")
                 val entries = input.readObject() as Map<String, *>
diff --git a/app/src/main/java/org/schabi/newpipe/util/ReleaseVersionUtil.kt b/app/src/main/java/org/schabi/newpipe/util/ReleaseVersionUtil.kt
index 21a9059e2..0c66cc6d4 100644
--- a/app/src/main/java/org/schabi/newpipe/util/ReleaseVersionUtil.kt
+++ b/app/src/main/java/org/schabi/newpipe/util/ReleaseVersionUtil.kt
@@ -7,8 +7,6 @@ import org.schabi.newpipe.App
 import org.schabi.newpipe.error.ErrorInfo
 import org.schabi.newpipe.error.ErrorUtil.Companion.createNotification
 import org.schabi.newpipe.error.UserAction
-import java.io.ByteArrayInputStream
-import java.io.InputStream
 import java.security.MessageDigest
 import java.security.NoSuchAlgorithmException
 import java.security.cert.CertificateEncodingException
@@ -47,10 +45,8 @@ object ReleaseVersionUtil {
                 return ""
             }
             val x509cert = try {
-                val cert = signatures[0].toByteArray()
-                val input: InputStream = ByteArrayInputStream(cert)
                 val cf = CertificateFactory.getInstance("X509")
-                cf.generateCertificate(input) as X509Certificate
+                cf.generateCertificate(signatures[0].toByteArray().inputStream()) as X509Certificate
             } catch (e: CertificateException) {
                 showRequestError(app, e, "Certificate error")
                 return ""