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+# SOP-Java-Picocli
+
+`sop-java-picocli` implements a command line interface for SOP implementations.
+
+## Backend Installation
+In order to enable OpenPGP operations, you need to set an implementation of [`sop-java`](sop-java.html):
+```java
+// static method call prior to execution of the main method
+SopCLI.setSopInstance(yourSopImpl);
+```
+
+## Usage
diff --git a/sop-java.md b/sop-java.md
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+# SOP-Java
+The [Stateless OpenPGP Protocol (SOP)](https://datatracker.ietf.org/doc/draft-dkg-openpgp-stateless-cli/) specification defines a straightforward interface for common OpenPGP operations.
+The Java library `sop-java` contains abstract interfaces reproducing the SOP API. This enables tight integration of OpenPGP functionality.
+
+The point of defining the SOP protocol as an abstract Java library is to enable consumers to decouple their application from the used OpenPGP backend.
+
+In the example below, replacing the backend would accomplished simply by swapping out the first line.
+
+## Usage Examples
+```java
+SOP sop = new FooSOP();
+
+// Generate an OpenPGP key
+// This needs to be kept secret
+byte[] key = sop.generateKey()
+        .userId("Alice <alice@example.org>")
+        .generate()
+        .getBytes();
+
+// Extract the certificate (public key)
+// This can be published and shared with others
+byte[] cert = sop.extractCert()
+        .key(key)
+        .getBytes();
+
+// Encrypt a message
+byte[] bobsCert = ...
+byte[] message = ...
+byte[] encrypted = sop.encrypt()
+        .withCert(cert)
+        .withCert(bobsCert)
+        .signWith(key)
+        .plaintext(message)
+        .getBytes();
+
+// Decrypt a message
+ByteArrayAndResult<DecryptionResult> messageAndVerifications = sop.decrypt()
+        .verifyWith(cert)
+        .withKey(key)
+        .ciphertext(encrypted)
+        .toByteArrayAndResult();
+byte[] decrypted = messageAndVerifications.getBytes();
+
+// Signature Verifications
+DecryptionResult messageInfo = messageAndVerifications.getResult();
+List<Verification> signatureVerifications = messageInfo.getVerifications();
+```
+
+
+## Known Implementations
+`PGPainless` provides an implementation of the `sop-java` library, named `pgpainless-sop`. Unsurprisingly, this library makes use of `pgpainless-core` to implement `sop-java`.
+
+## CLI
+If you need a command line interface for your `sop-java` implementation, see [sop-java-picocli](sop-java-picocli.html).
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+# Stateless OpenPGP Protocol
+The [Stateless OpenPGP Protocol (SOP)](https://datatracker.ietf.org/doc/draft-dkg-openpgp-stateless-cli/) specification defines a straightforward interface for commonly used OpenPGP operations.
+
+## Java API
+While the aforementioned document specifies a command line interface, shelling out to a CLI is not an ideal way of incorporating functionality into an application.
+A dedicated Java API is easier to consume and less error prone.
+
+For that reason, `sop-java` was created as a general definition of such API. `sop-java` itself does not have any dependencies on cryptographic libraries, so it is possible to 
+
+## Command Line Application