diff --git a/pgpainless-core/src/main/java/org/pgpainless/key/collection/KeyRingCollection.java b/pgpainless-core/src/main/java/org/pgpainless/key/collection/KeyRingCollection.java
deleted file mode 100644
index aae9f814..00000000
--- a/pgpainless-core/src/main/java/org/pgpainless/key/collection/KeyRingCollection.java
+++ /dev/null
@@ -1,105 +0,0 @@
-/*
- * Copyright 2018 Paul Schaub.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.pgpainless.key.collection;
-
-import javax.annotation.Nonnull;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-
-import org.bouncycastle.openpgp.PGPException;
-import org.bouncycastle.openpgp.PGPPublicKeyRing;
-import org.bouncycastle.openpgp.PGPPublicKeyRingCollection;
-import org.bouncycastle.openpgp.PGPSecretKeyRing;
-import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
-import org.pgpainless.PGPainless;
-
-public class KeyRingCollection {
-
-    private static final Logger LOGGER = Logger.getLogger(KeyRingCollection.class.getName());
-
-    private PGPPublicKeyRingCollection publicKeys;
-    private PGPSecretKeyRingCollection secretKeys;
-
-    public KeyRingCollection(@Nonnull PGPPublicKeyRingCollection publicKeyRings, @Nonnull PGPSecretKeyRingCollection secretKeyRings) {
-        this.publicKeys = publicKeyRings;
-        this.secretKeys = secretKeyRings;
-    }
-
-    public KeyRingCollection(File pubRingFile, File secRingFile) throws IOException, PGPException {
-
-        if (pubRingFile == null && secRingFile == null) {
-            throw new NullPointerException("pubRingFile and secRingFile cannot BOTH be null.");
-        }
-
-        if (pubRingFile != null) {
-            InputStream pubRingIn = new FileInputStream(pubRingFile);
-            this.publicKeys = PGPainless.readKeyRing().publicKeyRingCollection(pubRingIn);
-            pubRingIn.close();
-        }
-
-        if (secRingFile != null) {
-            InputStream secRingIn = new FileInputStream(secRingFile);
-            this.secretKeys = PGPainless.readKeyRing().secretKeyRingCollection(secRingIn);
-            secRingIn.close();
-        }
-    }
-
-    public KeyRingCollection(@Nonnull PGPPublicKeyRingCollection publicKeyRings) {
-        this.publicKeys = publicKeyRings;
-    }
-
-    public KeyRingCollection(@Nonnull PGPSecretKeyRingCollection secretKeyRings) {
-        this.secretKeys = secretKeyRings;
-    }
-
-    public void importPublicKeys(@Nonnull PGPPublicKeyRingCollection publicKeyRings) {
-        if (this.publicKeys == null) {
-            this.publicKeys = publicKeyRings;
-            return;
-        }
-
-        for (PGPPublicKeyRing keyRing : publicKeyRings) {
-            try {
-                this.publicKeys = PGPPublicKeyRingCollection.addPublicKeyRing(this.publicKeys, keyRing);
-            } catch (IllegalArgumentException e) {
-                // TODO: merge key rings.
-                LOGGER.log(Level.FINE, "Keyring " + Long.toHexString(keyRing.getPublicKey().getKeyID()) +
-                        " is already included in the collection. Skip!");
-            }
-        }
-    }
-
-    public void importSecretKeys(@Nonnull PGPSecretKeyRingCollection secretKeyRings) {
-        if (this.secretKeys == null) {
-            this.secretKeys = secretKeyRings;
-            return;
-        }
-
-        for (PGPSecretKeyRing keyRing : secretKeyRings) {
-            try {
-                this.secretKeys = PGPSecretKeyRingCollection.addSecretKeyRing(this.secretKeys, keyRing);
-            } catch (IllegalArgumentException e) {
-                // TODO: merge key rings.
-                LOGGER.log(Level.FINE, "Keyring " + Long.toHexString(keyRing.getPublicKey().getKeyID()) +
-                        " is already included in the collection. Skip!");
-            }
-        }
-    }
-}