diff --git a/build.gradle.kts b/build.gradle.kts
index 7374eb9af..3dc34fd76 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -184,7 +184,8 @@ subprojects {
         kotlinOptions.freeCompilerArgs = listOf(
             "-progressive",
             "-Xskip-runtime-version-check",
-            "-Xdisable-default-scripting-plugin"
+            "-Xdisable-default-scripting-plugin",
+            "-Xopt-in=kotlin.RequiresOptIn"
         )
         kotlinOptions.allWarningsAsErrors = shouldTreatCompilerWarningsAsErrors()
     }
diff --git a/detekt-api/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Extension.kt b/detekt-api/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Extension.kt
index 647e2177a..1eb18a99c 100644
--- a/detekt-api/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Extension.kt
+++ b/detekt-api/src/main/kotlin/io/gitlab/arturbosch/detekt/api/Extension.kt
@@ -6,12 +6,14 @@ package io.gitlab.arturbosch.detekt.api
  * - [FileProcessListener]
  * - [ConsoleReport]
  * - [OutputReport]
+ * - [ConfigValidator]
  */
 interface Extension {
     /**
      * Name of the extension.
      */
     val id: String get() = javaClass.simpleName
+
     /**
      * Is used to run extensions in a specific order.
      * The higher the priority the sooner the extension will run in detekt's lifecycle.
@@ -23,6 +25,14 @@ interface Extension {
      * to setup this extension.
      */
     fun init(config: Config) {
-        // for setup code
+        // implement for setup code
+    }
+
+    /**
+     * Setup extension by querying common paths and config options.
+     */
+    @OptIn(UnstableApi::class)
+    fun init(context: SetupContext) {
+        // implement for setup code
     }
 }
diff --git a/detekt-api/src/main/kotlin/io/gitlab/arturbosch/detekt/api/SetupContext.kt b/detekt-api/src/main/kotlin/io/gitlab/arturbosch/detekt/api/SetupContext.kt
new file mode 100644
index 000000000..0562aa8ef
--- /dev/null
+++ b/detekt-api/src/main/kotlin/io/gitlab/arturbosch/detekt/api/SetupContext.kt
@@ -0,0 +1,19 @@
+package io.gitlab.arturbosch.detekt.api
+
+import java.net.URI
+
+/**
+ * Context providing useful processing settings to initialize extensions.
+ */
+@UnstableApi
+interface SetupContext {
+    /**
+     * All config locations which where used to create [config].
+     */
+    val configUris: Collection<URI>
+
+    /**
+     * Configuration which is used to setup detekt.
+     */
+    val config: Config
+}
diff --git a/detekt-api/src/main/kotlin/io/gitlab/arturbosch/detekt/api/UnstableApi.kt b/detekt-api/src/main/kotlin/io/gitlab/arturbosch/detekt/api/UnstableApi.kt
new file mode 100644
index 000000000..3110c3f2d
--- /dev/null
+++ b/detekt-api/src/main/kotlin/io/gitlab/arturbosch/detekt/api/UnstableApi.kt
@@ -0,0 +1,7 @@
+package io.gitlab.arturbosch.detekt.api
+
+/**
+ * Experimental detekt api which may change on minor or patch versions.
+ */
+@RequiresOptIn
+annotation class UnstableApi
diff --git a/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/Configurations.kt b/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/Configurations.kt
index cdaf81ba6..d273cc1ef 100644
--- a/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/Configurations.kt
+++ b/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/Configurations.kt
@@ -6,6 +6,8 @@ import io.gitlab.arturbosch.detekt.api.internal.DisabledAutoCorrectConfig
 import io.gitlab.arturbosch.detekt.api.internal.FailFastConfig
 import io.gitlab.arturbosch.detekt.api.internal.PathFilters
 import io.gitlab.arturbosch.detekt.api.internal.YamlConfig
+import java.net.URI
+import java.net.URL
 import java.nio.file.Path
 
 fun CliArgs.createFilters(): PathFilters? = PathFilters.of(includes, excludes)
@@ -71,3 +73,10 @@ private fun parsePathConfig(configPath: String): Config {
 const val DEFAULT_CONFIG = "default-detekt-config.yml"
 
 fun loadDefaultConfig() = YamlConfig.loadResource(ClasspathResourceConverter().convert(DEFAULT_CONFIG))
+
+fun CliArgs.extractUris(): Collection<URI> {
+    val pathUris = config?.let { MultipleExistingPathConverter().convert(it).map(Path::toUri) } ?: emptyList()
+    val resourceUris = configResource?.let { MultipleClasspathResourceConverter().convert(it).map(URL::toURI) }
+        ?: emptyList()
+    return resourceUris + pathUris
+}
diff --git a/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/OutputFacade.kt b/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/OutputFacade.kt
index d9bba0f3c..c5dbb7f0c 100644
--- a/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/OutputFacade.kt
+++ b/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/OutputFacade.kt
@@ -23,6 +23,7 @@ class OutputFacade(
 
         reports.forEach { report ->
             report.init(config)
+            report.init(settings)
             when (report) {
                 is ConsoleReport -> handleConsoleReport(report, result)
                 is OutputReport -> handleOutputReport(report, result)
diff --git a/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/config/ConfigValidators.kt b/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/config/ConfigValidators.kt
index a62a17cc3..9a5f7dbb9 100644
--- a/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/config/ConfigValidators.kt
+++ b/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/config/ConfigValidators.kt
@@ -7,7 +7,9 @@ import io.gitlab.arturbosch.detekt.core.ProcessingSettings
 import java.util.ServiceLoader
 
 fun loadValidators(settings: ProcessingSettings): List<ConfigValidator> =
-    ServiceLoader.load(ConfigValidator::class.java, settings.pluginLoader).toList()
+    ServiceLoader.load(ConfigValidator::class.java, settings.pluginLoader)
+        .onEach { it.init(settings.config); it.init(settings) }
+        .toList()
 
 fun checkConfiguration(settings: ProcessingSettings) {
     val props = settings.config.subConfig("config")
diff --git a/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/runners/Runner.kt b/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/runners/Runner.kt
index 3597a9853..963ef91fe 100644
--- a/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/runners/Runner.kt
+++ b/detekt-cli/src/main/kotlin/io/gitlab/arturbosch/detekt/cli/runners/Runner.kt
@@ -11,6 +11,7 @@ import io.gitlab.arturbosch.detekt.cli.console.red
 import io.gitlab.arturbosch.detekt.cli.createClasspath
 import io.gitlab.arturbosch.detekt.cli.createFilters
 import io.gitlab.arturbosch.detekt.cli.createPlugins
+import io.gitlab.arturbosch.detekt.cli.extractUris
 import io.gitlab.arturbosch.detekt.cli.getOrComputeWeightedAmountOfIssues
 import io.gitlab.arturbosch.detekt.cli.isValidAndSmallerOrEqual
 import io.gitlab.arturbosch.detekt.cli.loadConfiguration
@@ -89,8 +90,8 @@ class Runner(
                 languageVersion = languageVersion,
                 jvmTarget = jvmTarget,
                 debug = arguments.debug,
-                outPrinter = outputPrinter,
-                errorPrinter = errorPrinter
+                outPrinter = outputPrinter, errorPrinter = errorPrinter,
+                configUris = extractUris()
             )
         }
         settings.debug { "Loading config took $configLoadTime ms" }
diff --git a/detekt-cli/src/main/resources/META-INF/services/io.gitlab.arturbosch.detekt.api.FileProcessListener b/detekt-cli/src/main/resources/META-INF/services/io.gitlab.arturbosch.detekt.api.FileProcessListener
index 626c2cf97..d0ede32a1 100644
--- a/detekt-cli/src/main/resources/META-INF/services/io.gitlab.arturbosch.detekt.api.FileProcessListener
+++ b/detekt-cli/src/main/resources/META-INF/services/io.gitlab.arturbosch.detekt.api.FileProcessListener
@@ -9,3 +9,4 @@ io.gitlab.arturbosch.detekt.core.processors.ProjectLLOCProcessor
 io.gitlab.arturbosch.detekt.core.processors.ProjectCLOCProcessor
 io.gitlab.arturbosch.detekt.core.processors.ProjectLOCProcessor
 io.gitlab.arturbosch.detekt.core.processors.ProjectSLOCProcessor
+io.gitlab.arturbosch.detekt.rules.documentation.LicenceHeaderLoaderExtension
diff --git a/detekt-cli/src/main/resources/default-detekt-config.yml b/detekt-cli/src/main/resources/default-detekt-config.yml
index 6e315b1f5..13da81504 100644
--- a/detekt-cli/src/main/resources/default-detekt-config.yml
+++ b/detekt-cli/src/main/resources/default-detekt-config.yml
@@ -34,13 +34,16 @@ console-reports:
 comments:
   active: true
   excludes: "**/test/**,**/androidTest/**,**/*.Test.kt,**/*.Spec.kt,**/*.Spek.kt"
+  AbsentOrWrongFileLicense:
+    active: false
+    licenseTemplateFile: 'license.template'
   CommentOverPrivateFunction:
     active: false
   CommentOverPrivateProperty:
     active: false
   EndOfSentenceFormat:
     active: false
-    endOfSentenceFormat: ([.?!][ \t\n\r\f<])|([.?!:]$)
+    endOfSentenceFormat: '([.?!][ \t\n\r\f<])|([.?!:]$)'
   UndocumentedPublicClass:
     active: false
     searchInNestedClass: true
diff --git a/detekt-core/src/main/kotlin/io/gitlab/arturbosch/detekt/core/FileProcessorLocator.kt b/detekt-core/src/main/kotlin/io/gitlab/arturbosch/detekt/core/FileProcessorLocator.kt
index f52b498c6..9cad2e61c 100644
--- a/detekt-core/src/main/kotlin/io/gitlab/arturbosch/detekt/core/FileProcessorLocator.kt
+++ b/detekt-core/src/main/kotlin/io/gitlab/arturbosch/detekt/core/FileProcessorLocator.kt
@@ -15,8 +15,9 @@ class FileProcessorLocator(private val settings: ProcessingSettings) {
         if (processorsActive) {
             ServiceLoader.load(FileProcessListener::class.java, settings.pluginLoader)
                 .filter { it.id !in excludes }
-                .onEach { it.init(config) }
+                .onEach { it.init(config); it.init(settings) }
                 .toList()
+                .also { settings.debug { "Registered file processors: $it" } }
         } else {
             emptyList()
         }
diff --git a/detekt-core/src/main/kotlin/io/gitlab/arturbosch/detekt/core/ProcessingSettings.kt b/detekt-core/src/main/kotlin/io/gitlab/arturbosch/detekt/core/ProcessingSettings.kt
index a98c7a9d7..3db1dbfbd 100644
--- a/detekt-core/src/main/kotlin/io/gitlab/arturbosch/detekt/core/ProcessingSettings.kt
+++ b/detekt-core/src/main/kotlin/io/gitlab/arturbosch/detekt/core/ProcessingSettings.kt
@@ -1,6 +1,8 @@
 package io.gitlab.arturbosch.detekt.core
 
 import io.gitlab.arturbosch.detekt.api.Config
+import io.gitlab.arturbosch.detekt.api.SetupContext
+import io.gitlab.arturbosch.detekt.api.UnstableApi
 import io.gitlab.arturbosch.detekt.api.internal.PathFilters
 import io.gitlab.arturbosch.detekt.api.internal.createCompilerConfiguration
 import io.gitlab.arturbosch.detekt.api.internal.createKotlinCoreEnvironment
@@ -12,6 +14,7 @@ import org.jetbrains.kotlin.config.LanguageVersion
 import org.jetbrains.kotlin.utils.closeQuietly
 import java.io.Closeable
 import java.io.PrintStream
+import java.net.URI
 import java.net.URLClassLoader
 import java.nio.file.Files
 import java.nio.file.Path
@@ -24,10 +27,11 @@ import java.util.concurrent.ForkJoinPool
  * Always close the settings as dispose the Kotlin compiler and detekt class loader.
  * If using a custom executor service be aware that detekt won't shut it down after use!
  */
+@OptIn(UnstableApi::class)
 @Suppress("LongParameterList")
 class ProcessingSettings @JvmOverloads constructor(
     val inputPaths: List<Path>,
-    val config: Config = Config.empty,
+    override val config: Config = Config.empty,
     val pathFilters: PathFilters? = null,
     val parallelCompilation: Boolean = false,
     val excludeDefaultRuleSets: Boolean = false,
@@ -39,8 +43,9 @@ class ProcessingSettings @JvmOverloads constructor(
     val outPrinter: PrintStream = System.out,
     val errorPrinter: PrintStream = System.err,
     val autoCorrect: Boolean = false,
-    val debug: Boolean = false
-) : AutoCloseable, Closeable {
+    val debug: Boolean = false,
+    override val configUris: Collection<URI> = emptyList()
+) : AutoCloseable, Closeable, SetupContext {
     /**
      * Single project input path constructor.
      */
@@ -58,7 +63,8 @@ class ProcessingSettings @JvmOverloads constructor(
         outPrinter: PrintStream = System.out,
         errorPrinter: PrintStream = System.err,
         autoCorrect: Boolean = false,
-        debug: Boolean = false
+        debug: Boolean = false,
+        configUris: Collection<URI> = emptyList()
     ) : this(
         listOf(inputPath),
         config,
@@ -73,7 +79,8 @@ class ProcessingSettings @JvmOverloads constructor(
         outPrinter,
         errorPrinter,
         autoCorrect,
-        debug
+        debug,
+        configUris
     )
 
     init {
diff --git a/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/AbsentOrWrongFileLicense.kt b/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/AbsentOrWrongFileLicense.kt
new file mode 100644
index 000000000..ae9669280
--- /dev/null
+++ b/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/AbsentOrWrongFileLicense.kt
@@ -0,0 +1,47 @@
+package io.gitlab.arturbosch.detekt.rules.documentation
+
+import io.gitlab.arturbosch.detekt.api.CodeSmell
+import io.gitlab.arturbosch.detekt.api.Config
+import io.gitlab.arturbosch.detekt.api.Debt
+import io.gitlab.arturbosch.detekt.api.Entity
+import io.gitlab.arturbosch.detekt.api.Issue
+import io.gitlab.arturbosch.detekt.api.Rule
+import io.gitlab.arturbosch.detekt.api.Severity
+import org.jetbrains.kotlin.psi.KtFile
+
+/**
+ * This rule will report every Kotlin source file which doesn't have required license header.
+ *
+ * @configuration licenseTemplateFile - path to file with license header template resolved relatively to config file
+ * (default: `'license.template'`)
+ */
+class AbsentOrWrongFileLicense(config: Config = Config.empty) : Rule(config) {
+
+    override val issue = Issue(
+        id = RULE_NAME,
+        severity = Severity.Maintainability,
+        description = "License text is absent or incorrect in the file.",
+        debt = Debt.FIVE_MINS
+    )
+
+    override fun visitCondition(root: KtFile): Boolean =
+        super.visitCondition(root) && root.hasLicenseHeader()
+
+    override fun visitKtFile(file: KtFile) {
+        if (!file.hasValidLicense()) {
+            report(CodeSmell(
+                issue,
+                Entity.from(file),
+                "Expected license not found or incorrect in the file: ${file.name}."
+            ))
+        }
+    }
+
+    private fun KtFile.hasValidLicense(): Boolean = text.startsWith(getLicenseHeader())
+
+    companion object {
+        const val PARAM_LICENSE_TEMPLATE_FILE = "licenseTemplateFile"
+        const val DEFAULT_LICENSE_TEMPLATE_FILE = "license.template"
+        val RULE_NAME: String = AbsentOrWrongFileLicense::class.java.simpleName
+    }
+}
diff --git a/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/EndOfSentenceFormat.kt b/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/EndOfSentenceFormat.kt
index 8a3d01e7a..5b2e25535 100644
--- a/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/EndOfSentenceFormat.kt
+++ b/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/EndOfSentenceFormat.kt
@@ -30,7 +30,7 @@ class KDocStyle(config: Config = Config.empty) : MultiRule() {
  * It should end with proper punctuation or with a correct URL.
  *
  * @configuration endOfSentenceFormat - regular expression which should match the end of the first sentence in the KDoc
- * (default: `([.?!][ \t\n\r\f<])|([.?!:]$)`)
+ * (default: `'([.?!][ \t\n\r\f<])|([.?!:]$)'`)
  */
 @Suppress("MemberNameEqualsClassName")
 class EndOfSentenceFormat(config: Config = Config.empty) : Rule(config) {
diff --git a/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/LicenceHeaderLoaderExtension.kt b/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/LicenceHeaderLoaderExtension.kt
new file mode 100644
index 000000000..cc2ecc015
--- /dev/null
+++ b/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/LicenceHeaderLoaderExtension.kt
@@ -0,0 +1,78 @@
+package io.gitlab.arturbosch.detekt.rules.documentation
+
+import io.gitlab.arturbosch.detekt.api.Config
+import io.gitlab.arturbosch.detekt.api.FileProcessListener
+import io.gitlab.arturbosch.detekt.api.SetupContext
+import io.gitlab.arturbosch.detekt.api.SingleAssign
+import io.gitlab.arturbosch.detekt.api.UnstableApi
+import io.gitlab.arturbosch.detekt.rules.documentation.AbsentOrWrongFileLicense.Companion.DEFAULT_LICENSE_TEMPLATE_FILE
+import io.gitlab.arturbosch.detekt.rules.documentation.AbsentOrWrongFileLicense.Companion.PARAM_LICENSE_TEMPLATE_FILE
+import io.gitlab.arturbosch.detekt.rules.documentation.AbsentOrWrongFileLicense.Companion.RULE_NAME
+import org.jetbrains.kotlin.com.intellij.openapi.util.Key
+import org.jetbrains.kotlin.com.intellij.openapi.util.text.StringUtilRt
+import org.jetbrains.kotlin.psi.KtFile
+import java.io.BufferedReader
+import java.nio.file.Files
+import java.nio.file.Path
+import java.nio.file.Paths
+
+@OptIn(UnstableApi::class)
+class LicenceHeaderLoaderExtension : FileProcessListener {
+
+    private var config: Config by SingleAssign()
+    private var configPath: Path? = null
+
+    override fun init(context: SetupContext) {
+        this.config = context.config
+        this.configPath = context.configUris.lastOrNull()?.let(Paths::get)
+    }
+
+    override fun onStart(files: List<KtFile>) {
+        fun Config.isActive() = this.valueOrDefault(Config.ACTIVE_KEY, false)
+
+        fun shouldRuleRun(): Boolean {
+            val comments = config.subConfig("comments")
+            val ruleConfig = comments.subConfig(RULE_NAME)
+            return comments.isActive() && ruleConfig.isActive()
+        }
+
+        fun getPathToTemplate(): String = config.subConfig("comments")
+            .subConfig(RULE_NAME)
+            .valueOrDefault(PARAM_LICENSE_TEMPLATE_FILE, DEFAULT_LICENSE_TEMPLATE_FILE)
+
+        fun loadLicence(dir: Path): String {
+            val templateFile = dir.resolve(getPathToTemplate())
+
+            require(Files.exists(templateFile)) {
+                """
+                Rule '$RULE_NAME': License template file not found at `${templateFile.toAbsolutePath()}`.
+                Create file license header file or check your running path.
+            """.trimIndent()
+            }
+
+            return Files.newBufferedReader(templateFile)
+                .use(BufferedReader::readText)
+                .let(StringUtilRt::convertLineSeparators)
+        }
+
+        fun cacheLicence(dir: Path) {
+            val licenceHeader = loadLicence(dir)
+            for (file in files) {
+                file.putUserData(LICENCE_KEY, licenceHeader)
+            }
+        }
+
+        if (configPath != null && shouldRuleRun()) {
+            val configDir = configPath?.parent
+            if (configDir != null) {
+                cacheLicence(configDir)
+            }
+        }
+    }
+}
+
+internal val LICENCE_KEY = Key.create<String>("LICENCE_HEADER")
+
+internal fun KtFile.hasLicenseHeader(): Boolean = this.getUserData(LICENCE_KEY) != null
+
+internal fun KtFile.getLicenseHeader(): String = this.getUserData(LICENCE_KEY) ?: error("License header expected")
diff --git a/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/providers/CommentSmellProvider.kt b/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/providers/CommentSmellProvider.kt
index 2f7941fde..0a84dc5a8 100644
--- a/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/providers/CommentSmellProvider.kt
+++ b/detekt-rules/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/providers/CommentSmellProvider.kt
@@ -3,6 +3,7 @@ package io.gitlab.arturbosch.detekt.rules.providers
 import io.gitlab.arturbosch.detekt.api.Config
 import io.gitlab.arturbosch.detekt.api.RuleSet
 import io.gitlab.arturbosch.detekt.api.internal.DefaultRuleSetProvider
+import io.gitlab.arturbosch.detekt.rules.documentation.AbsentOrWrongFileLicense
 import io.gitlab.arturbosch.detekt.rules.documentation.CommentOverPrivateFunction
 import io.gitlab.arturbosch.detekt.rules.documentation.CommentOverPrivateProperty
 import io.gitlab.arturbosch.detekt.rules.documentation.KDocStyle
@@ -27,7 +28,8 @@ class CommentSmellProvider : DefaultRuleSetProvider {
                 KDocStyle(config),
                 UndocumentedPublicClass(config),
                 UndocumentedPublicFunction(config),
-                UndocumentedPublicProperty(config)
+                UndocumentedPublicProperty(config),
+                AbsentOrWrongFileLicense(config)
         ))
     }
 }
diff --git a/detekt-rules/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/AbsentOrWrongFileLicenseSpec.kt b/detekt-rules/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/AbsentOrWrongFileLicenseSpec.kt
new file mode 100644
index 000000000..a15b99e58
--- /dev/null
+++ b/detekt-rules/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/documentation/AbsentOrWrongFileLicenseSpec.kt
@@ -0,0 +1,69 @@
+package io.gitlab.arturbosch.detekt.rules.documentation
+
+import io.gitlab.arturbosch.detekt.api.Config
+import io.gitlab.arturbosch.detekt.api.Finding
+import io.gitlab.arturbosch.detekt.api.SetupContext
+import io.gitlab.arturbosch.detekt.api.UnstableApi
+import io.gitlab.arturbosch.detekt.api.internal.YamlConfig
+import io.gitlab.arturbosch.detekt.test.assertThat
+import io.gitlab.arturbosch.detekt.test.compileContentForTest
+import io.gitlab.arturbosch.detekt.test.lint
+import io.gitlab.arturbosch.detekt.test.resource
+import org.spekframework.spek2.Spek
+import org.spekframework.spek2.style.specification.describe
+import java.net.URI
+import java.nio.file.Paths
+
+internal class AbsentOrWrongFileLicenseSpec : Spek({
+
+    describe("AbsentOrWrongFileLicense rule") {
+        context("file with correct license header") {
+            it("reports nothing") {
+                val findings = checkLicence("""
+                    /* LICENSE */
+                    package cases
+                """.trimIndent())
+
+                assertThat(findings).isEmpty()
+            }
+        }
+
+        context("file with incorrect license header") {
+            it("reports missed license header") {
+                val findings = checkLicence("""
+                    /* WRONG LICENSE */
+                    package cases
+                """.trimIndent())
+
+                assertThat(findings).hasSize(1)
+            }
+        }
+
+        context("file with absent license header") {
+            it("reports missed license header") {
+                val findings = checkLicence("""
+                    package cases
+                """.trimIndent())
+
+                assertThat(findings).hasSize(1)
+            }
+        }
+    }
+})
+
+@OptIn(UnstableApi::class)
+private fun checkLicence(content: String): List<Finding> {
+    val file = compileContentForTest(content)
+
+    val resource = resource("license-config.yml")
+    val config = YamlConfig.load(Paths.get(resource))
+    LicenceHeaderLoaderExtension().apply {
+        init(object : SetupContext {
+            override val configUris: Collection<URI> = listOf(resource)
+            override val config: Config = config
+        })
+        onStart(listOf(file))
+    }
+
+    return AbsentOrWrongFileLicense().lint(file)
+}
diff --git a/detekt-rules/src/test/resources/license-config.yml b/detekt-rules/src/test/resources/license-config.yml
new file mode 100644
index 000000000..c5cb6b9cb
--- /dev/null
+++ b/detekt-rules/src/test/resources/license-config.yml
@@ -0,0 +1,5 @@
+comments:
+  active: true
+  AbsentOrWrongFileLicense:
+    active: true
+    licenseTemplateFile: "license.template"
diff --git a/detekt-rules/src/test/resources/license.template b/detekt-rules/src/test/resources/license.template
new file mode 100644
index 000000000..9e6ea0315
--- /dev/null
+++ b/detekt-rules/src/test/resources/license.template
@@ -0,0 +1 @@
+/* LICENSE */
diff --git a/docs/pages/documentation/comments.md b/docs/pages/documentation/comments.md
index c26ed5ef7..d66bbc8e1 100644
--- a/docs/pages/documentation/comments.md
+++ b/docs/pages/documentation/comments.md
@@ -9,6 +9,20 @@ folder: documentation
 This rule set provides rules that address issues in comments and documentation
 of the code.
 
+### AbsentOrWrongFileLicense
+
+This rule will report every Kotlin source file which doesn't have required license header.
+
+**Severity**: Maintainability
+
+**Debt**: 5min
+
+#### Configuration options:
+
+* ``licenseTemplateFile`` (default: ``'license.template'``)
+
+   path to file with license header template resolved relatively to config file
+
 ### CommentOverPrivateFunction
 
 This rule reports comments and documentation that has been added to private functions. These comments get reported
@@ -50,7 +64,7 @@ It should end with proper punctuation or with a correct URL.
 
 #### Configuration options:
 
-* ``endOfSentenceFormat`` (default: ``([.?!][ \t\n\r\f<])|([.?!:]$)``)
+* ``endOfSentenceFormat`` (default: ``'([.?!][ \t\n\r\f<])|([.?!:]$)'``)
 
    regular expression which should match the end of the first sentence in the KDoc
 
diff --git a/docs/pages/kdoc/detekt-api/alltypes/index.md b/docs/pages/kdoc/detekt-api/alltypes/index.md
index 8914b6bcc..999b4e20a 100644
--- a/docs/pages/kdoc/detekt-api/alltypes/index.md
+++ b/docs/pages/kdoc/detekt-api/alltypes/index.md
@@ -357,6 +357,13 @@ A rule set is a collection of rules and must be defined within a rule set provid
 A rule set provider, as the name states, is responsible for creating rule sets.
 
 
+|
+
+##### [io.gitlab.arturbosch.detekt.api.SetupContext](../io.gitlab.arturbosch.detekt.api/-setup-context/index.html)
+
+Context providing useful processing settings to initialize extensions.
+
+
 |
 
 ##### [io.gitlab.arturbosch.detekt.api.Severity](../io.gitlab.arturbosch.detekt.api/-severity/index.html)
@@ -422,6 +429,13 @@ Provides a threshold attribute for this rule, which is specified manually for de
 but can be also obtained from within a configuration object.
 
 
+|
+
+##### [io.gitlab.arturbosch.detekt.api.UnstableApi](../io.gitlab.arturbosch.detekt.api/-unstable-api/index.html)
+
+Experimental detekt api which may change on minor or patch versions.
+
+
 |
 
 ##### [io.gitlab.arturbosch.detekt.api.internal.ValidatableConfiguration](../io.gitlab.arturbosch.detekt.api.internal/-validatable-configuration/index.html)
diff --git a/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-extension/index.md b/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-extension/index.md
index de47a1767..51268cb8c 100644
--- a/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-extension/index.md
+++ b/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-extension/index.md
@@ -14,6 +14,7 @@ Currently supported extensions are:
 * [FileProcessListener](../-file-process-listener/index.html)
 * [ConsoleReport](../-console-report/index.html)
 * [OutputReport](../-output-report/index.html)
+* [ConfigValidator](../-config-validator/index.html)
 
 ### Properties
 
@@ -22,7 +23,7 @@ Currently supported extensions are:
 
 ### Functions
 
-| [init](init.html) | Allows to read any or even user defined properties from the detekt yaml config to setup this extension.`open fun init(config: `[`Config`](../-config/index.html)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) |
+| [init](init.html) | Allows to read any or even user defined properties from the detekt yaml config to setup this extension.`open fun init(config: `[`Config`](../-config/index.html)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>Setup extension by querying common paths and config options.`open fun init(context: `[`SetupContext`](../-setup-context/index.html)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) |
 
 ### Inheritors
 
diff --git a/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-extension/init.md b/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-extension/init.md
index 8ab47f284..6b741d907 100644
--- a/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-extension/init.md
+++ b/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-extension/init.md
@@ -11,3 +11,7 @@ title: Extension.init - detekt-api
 Allows to read any or even user defined properties from the detekt yaml config
 to setup this extension.
 
+`open fun init(context: `[`SetupContext`](../-setup-context/index.html)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)
+
+Setup extension by querying common paths and config options.
+
diff --git a/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-yaml-config/index.md b/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-yaml-config/index.md
index 3029b2df8..254a42440 100644
--- a/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-yaml-config/index.md
+++ b/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/-yaml-config/index.md
@@ -13,6 +13,7 @@ yaml specification.
 
 ### Properties
 
+| [location](location.html) | `val location: Location` |
 | [parent](parent.html) | Returns the parent config which encloses this config part.`val parent: Parent?` |
 | [properties](properties.html) | `val properties: `[`Map`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-map/index.html)`<`[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`, `[`Any`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html)`>` |
 
diff --git a/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/index.md b/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/index.md
index 4a72ec5b1..324c557de 100644
--- a/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/index.md
+++ b/docs/pages/kdoc/detekt-api/io.gitlab.arturbosch.detekt.api/index.md
@@ -44,6 +44,7 @@ title: io.gitlab.arturbosch.detekt.api - detekt-api
 | [RuleSet](-rule-set/index.html) | A rule set is a collection of rules and must be defined within a rule set provider implementation.`class RuleSet` |
 | [RuleSetId](-rule-set-id.html) | `typealias RuleSetId = `[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html) |
 | [RuleSetProvider](-rule-set-provider/index.html) | A rule set provider, as the name states, is responsible for creating rule sets.`interface RuleSetProvider` |
+| [SetupContext](-setup-context/index.html) | Context providing useful processing settings to initialize extensions.`interface SetupContext` |
 | [Severity](-severity/index.html) | Rules can classified into different severity grades. Maintainer can choose a grade which is most harmful to their projects.`enum class Severity` |
 | [SingleAssign](-single-assign/index.html) | Allows to assign a property just once. Further assignments result in [IllegalStateException](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-illegal-state-exception/index.html)'s.`class SingleAssign<T : `[`Any`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html)`>` |
 | [SourceLocation](-source-location/index.html) | Stores line and column information of a location.`data class SourceLocation` |
@@ -53,6 +54,10 @@ title: io.gitlab.arturbosch.detekt.api - detekt-api
 | [ThresholdRule](-threshold-rule/index.html) | Provides a threshold attribute for this rule, which is specified manually for default values but can be also obtained from within a configuration object.`abstract class ThresholdRule : `[`Rule`](-rule/index.html) |
 | [YamlConfig](-yaml-config.html) | Config implementation using the yaml format. SubConfigurations can return sub maps according to the yaml specification.`typealias ~~YamlConfig~~ = `[`YamlConfig`](../io.gitlab.arturbosch.detekt.api.internal/-yaml-config/index.html) |
 
+### Annotations
+
+| [UnstableApi](-unstable-api/index.html) | Experimental detekt api which may change on minor or patch versions.`annotation class UnstableApi` |
+
 ### Extensions for External Classes
 
 | [kotlin.String](kotlin.-string/index.html) |  |