diff --git a/.codeclimate.yml b/.codeclimate.yml
new file mode 100644
index 0000000..09c810c
--- /dev/null
+++ b/.codeclimate.yml
@@ -0,0 +1,7 @@
+plugins:
+  bandit:
+    enabled: true
+  sonar-python:
+    enabled: true
+  pylint:
+    enabled: true
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..b35140d
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,28 @@
+root = true
+
+[*]
+insert_final_newline = true
+
+# Matches multiple files with brace expansion notation
+# Set default charset
+[*.{js,py}]
+charset = utf-8
+
+# 4 space indentation
+[*.py]
+indent_style = space
+indent_size = 4
+
+# Tab indentation (no size specified)
+[Makefile]
+indent_style = tab
+
+# Indentation override for all JS under lib directory
+[lib/**.js]
+indent_style = space
+indent_size = 2
+
+# Matches the exact files either package.json or .travis.yml
+[{package.json,.travis.yml}]
+indent_style = space
+indent_size = 2
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6e1f44b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.DS_Store
+venv/
+.idea/
+app/cert/*.*
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 0000000..2a07981
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,30 @@
+cache:
+  key: one-key-to-rule-them-all
+
+build:
+  image: docker:dind
+  interruptible: true
+  stage: build
+  rules:
+    - if: $CI_COMMIT_BRANCH
+  tags: [ docker ]
+  script:
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+    - docker build . --tag ${CI_REGISTRY}/${CI_PROJECT_PATH}/${CI_BUILD_REF_NAME}:${CI_BUILD_REF}
+    - docker push ${CI_REGISTRY}/${CI_PROJECT_PATH}/${CI_BUILD_REF_NAME}:${CI_BUILD_REF}
+
+test:
+  stage: test
+  script:
+    - echo "Nothing to do ..."
+
+deploy:
+  stage: deploy
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+  script:
+    - docker login -u $PUBLIC_REGISTRY_USER -p $PUBLIC_REGISTRY_TOKEN
+    - docker build . --tag $PUBLIC_REGISTRY_USER/${CI_PROJECT_PATH}:${CI_BUILD_REF}
+    - docker build . --tag $PUBLIC_REGISTRY_USER/${CI_PROJECT_PATH}:latest
+    - docker push $PUBLIC_REGISTRY_USER/${CI_PROJECT_PATH}:${CI_BUILD_REF}
+    - docker push $PUBLIC_REGISTRY_USER/${CI_PROJECT_PATH}:latest
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..78bae1b
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,16 @@
+FROM python:3.10-alpine
+
+COPY requirements.txt /tmp/requirements.txt
+
+RUN apk update \
+ && apk add --no-cache --virtual build-deps gcc g++ python3-dev musl-dev \
+ && apk add --no-cache postgresql postgresql-dev mariadb-connector-c-dev \
+ && pip install --no-cache-dir --upgrade uvicorn \
+ && pip install --no-cache-dir psycopg2==2.9.3 mysqlclient==2.1.1 pysqlite3==0.4.7 \
+ && pip install --no-cache-dir -r /tmp/requirements.txt \
+ && apk del build-deps
+
+COPY app /app
+
+HEALTHCHECK --start-period=30s --interval=10s --timeout=5s --retries=3 CMD curl --fail http://localhost/status || exit 1
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "443", "--app-dir", "/app", "--proxy-headers", "--ssl-keyfile", "/app/cert/webserver.key", "--ssl-certfile", "/app/cert/webserver.crt"]
diff --git a/README.md b/README.md
index 5861a35..ed2697b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,78 @@
 # FastAPI-DLS
 
-Minimal Licencing Servie.
+Minimal Delegated License Service (DLS).
+
+# Setup (Docker)
+
+**Run this on the Docker-Host**
+
+```shell
+WORKING_DIR=/opt/docker/fastapi-dls/cert
+mkdir -p $WORKING_DIR
+cd $WORKING_DIR
+openssl genrsa -out $WORKING_DIR/instance.private.pem 2048 
+openssl rsa -in $WORKING_DIR/instance.private.pem -outform PEM -pubout -out $WORKING_DIR/instance.public.pem
+openssl req -x509 -nodes -days 3650 -newkey rsa:2048 -keyout  $WORKING_DIR/webserver.key -out $WORKING_DIR/webserver.crt
+docker run -e DLS_URL=`hostname -i` -e DLS_PORT=443 -p 443:443 -v $WORKING_DIR:/app/cert collinwebdesigns/fastapi-dls:latest
+```
+
+# Installation
+
+**The token file has to be copied! It's not enough to C&P file contents, because there can be special characters.**
+
+## Linux
+
+```shell
+curl --insecure -X GET https://<dls-hostname-or-ip>/client-token -o /etc/nvidia/ClientConfigToken/client_configuration_token.tok
+service nvidia-gridd restart
+nvidia-smi -q | grep "License"
+```
+
+## Windows
+
+Download file and place it into `C:\Program Files\NVIDIA Corporation\vGPU Licensing\ClientConfigToken`.
+Now restart `NvContainerLocalSystem` service.
+
+# Troubleshoot
+
+## Linux
+
+Logs are available with `journalctl -u nvidia-gridd -f`.
+
+## Windows
+
+Logs are available in `C:\Users\Public\Documents\Nvidia\LoggingLog.NVDisplay.Container.exe.log`.
+
+# Known Issues
+
+## Linux
+
+Currently, there are no known issues.
+
+## Windows
+
+On Windows there is currently a problem returning the license. As you can see the license is installed successfully
+after
+a few minutes. About the time of the first *lease period* the driver gets a *Mismatch between client and server with
+respect to licenses held*.
+
+<details>
+  <summary>Log</summary>
+
+```
+Tue Dec 20 05:55:52 2022:<2>:NLS initialized
+Tue Dec 20 05:55:57 2022:<2>:Mismatch between client and server with respect to licenses held. Returning the licenses
+Tue Dec 20 05:55:58 2022:<2>:License returned successfully. (Info: 192.168.178.33)
+Tue Dec 20 05:56:20 2022:<2>:Mismatch between client and server with respect to licenses held. Returning the licenses
+Tue Dec 20 05:56:21 2022:<2>:License returned successfully. (Info: 192.168.178.33)
+Tue Dec 20 05:56:46 2022:<2>:Mismatch between client and server with respect to licenses held. Returning the licenses
+Tue Dec 20 05:56:47 2022:<2>:License returned successfully. (Info: 192.168.178.33)
+Tue Dec 20 05:56:54 2022:<1>:License renewed successfully. (Info: 192.168.178.33, NVIDIA RTX Virtual Workstation; Expiry: 2022-12-20 5:11:54 GMT)
+Tue Dec 20 05:57:17 2022:<2>:Mismatch between client and server with respect to licenses held. Returning the licenses
+Tue Dec 20 05:57:18 2022:<2>:License returned successfully. (Info: 192.168.178.33)
+Tue Dec 20 05:59:20 2022:<1>:License renewed successfully. (Info: 192.168.178.33, NVIDIA RTX Virtual Workstation; Expiry: 2022-12-20 5:14:20 GMT)
+Tue Dec 20 06:01:45 2022:<1>:License renewed successfully. (Info: 192.168.178.33, NVIDIA RTX Virtual Workstation; Expiry: 2022-12-20 5:16:45 GMT)
+Tue Dec 20 06:04:10 2022:<1>:License renewed successfully. (Info: 192.168.178.33, NVIDIA RTX Virtual Workstation; Expiry: 2022-12-20 5:19:10 GMT)
+```
+
+</details>
diff --git a/ToDo.md b/ToDo.md
new file mode 100644
index 0000000..c87b012
--- /dev/null
+++ b/ToDo.md
@@ -0,0 +1,9 @@
+# FastAPI-DLS Server
+
+
+## ToDo
+
+- Create Client Token (`.tok`-file)
+- Docker Image
+- Create Certificates if not exist
+- Keep track of clients and Leases
diff --git a/app/helper.py b/app/helper.py
new file mode 100644
index 0000000..b416ab3
--- /dev/null
+++ b/app/helper.py
@@ -0,0 +1,20 @@
+from Crypto.PublicKey import RSA
+from Crypto.PublicKey.RSA import RsaKey
+
+
+def load_file(filename) -> bytes:
+    with open(filename, 'rb') as file:
+        content = file.read()
+    return content
+
+
+def load_key(filename) -> RsaKey:
+    return RSA.import_key(extern_key=load_file(filename), passphrase=None)
+
+
+def private_bytes(rsa: RsaKey) -> bytes:
+    return rsa.export_key(format='PEM', passphrase=None, protection=None)
+
+
+def public_key(rsa: RsaKey) -> bytes:
+    return rsa.public_key().export_key(format='PEM')
diff --git a/app/main.py b/app/main.py
new file mode 100644
index 0000000..42ac2d2
--- /dev/null
+++ b/app/main.py
@@ -0,0 +1,295 @@
+from base64 import b64encode
+from hashlib import sha256
+from uuid import uuid4
+from os.path import join, dirname
+from os import getenv
+from fastapi import FastAPI, HTTPException
+from fastapi.requests import Request
+import json
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
+from calendar import timegm
+from jose import jws, jwk, jwt
+from jose.constants import ALGORITHMS
+from starlette.responses import StreamingResponse, JSONResponse
+
+from helper import load_key, private_bytes, public_key
+
+# todo: initialize certificate (or should be done by user, and passed through "volumes"?)
+
+app = FastAPI()
+
+LEASE_EXPIRE_DELTA = relativedelta(minutes=15)  # days=90
+
+DLS_URL = str(getenv('DLS_URL', 'localhost'))
+DLS_PORT = int(getenv('DLS_PORT', '443'))
+SITE_KEY_XID = getenv('SITE_KEY_XID', '00000000-0000-0000-0000-000000000000')
+INSTANCE_KEY_RSA = load_key(join(dirname(__file__), 'cert/instance.private.pem'))
+INSTANCE_KEY_PUB = load_key(join(dirname(__file__), 'cert/instance.public.pem'))
+
+
+@app.get('/')
+async def index():
+    return JSONResponse({'hello': 'world'})
+
+
+@app.get('/status')
+async def status(request: Request):
+    return JSONResponse({'status': 'up'})
+
+
+# venv/lib/python3.9/site-packages/nls_core_service_instance/service_instance_token_manager.py
+@app.get('/client-token')
+async def client_token():
+    cur_time = datetime.utcnow()
+    exp_time = cur_time + relativedelta(years=12)
+
+    service_instance_public_key_configuration = {
+        "service_instance_public_key_me": {
+            "mod": hex(INSTANCE_KEY_PUB.public_key().n)[2:],
+            "exp": INSTANCE_KEY_PUB.public_key().e,
+        },
+        "service_instance_public_key_pem": INSTANCE_KEY_PUB.export_key().decode('utf-8'),
+        "key_retention_mode": "LATEST_ONLY"
+    }
+
+    payload = {
+        "jti": str(uuid4()),
+        "iss": "NLS Service Instance",
+        "aud": "NLS Licensed Client",
+        "iat": timegm(cur_time.timetuple()),
+        "nbf": timegm(cur_time.timetuple()),
+        "exp": timegm(exp_time.timetuple()),
+        "update_mode": "ABSOLUTE",
+        "scope_ref_list": [str(uuid4())],
+        "fulfillment_class_ref_list": [],
+        "service_instance_configuration": {
+            "nls_service_instance_ref": "00000000-0000-0000-0000-000000000000",
+            "svc_port_set_list": [
+                {
+                    "idx": 0,
+                    "d_name": "DLS",
+                    "svc_port_map": [
+                        {"service": "auth", "port": DLS_PORT},
+                        {"service": "lease", "port": DLS_PORT}
+                    ]
+                }
+            ],
+            "node_url_list": [{"idx": 0, "url": DLS_URL, "url_qr": DLS_URL, "svc_port_set_idx": 0}]
+        },
+        "service_instance_public_key_configuration": service_instance_public_key_configuration,
+    }
+
+    key = jwk.construct(INSTANCE_KEY_RSA.export_key().decode('utf-8'), algorithm=ALGORITHMS.RS256)
+    data = jws.sign(payload, key=key, headers=None, algorithm='RS256')
+
+    response = StreamingResponse(iter([data]), media_type="text/plain")
+    filename = f'client_configuration_token_{datetime.now().strftime("%d-%m-%y-%H-%M-%S")}'
+    response.headers["Content-Disposition"] = f'attachment; filename={filename}'
+    return response
+
+
+# venv/lib/python3.9/site-packages/nls_services_auth/test/test_origins_controller.py
+@app.post('/auth/v1/origin')
+async def auth_origin(request: Request):
+    body = await request.body()
+    body = body.decode('utf-8')
+    j = json.loads(body)
+    # {"candidate_origin_ref":"00112233-4455-6677-8899-aabbccddeeff","environment":{"fingerprint":{"mac_address_list":["ff:ff:ff:ff:ff:ff"]},"hostname":"my-hostname","ip_address_list":["192.168.178.123","fe80::","fe80::1%enp6s18"],"guest_driver_version":"510.85.02","os_platform":"Debian GNU/Linux 11 (bullseye) 11","os_version":"11 (bullseye)"},"registration_pending":false,"update_pending":false}
+    print(f'> [  origin  ]: {j}')
+
+    cur_time = datetime.utcnow()
+    response = {
+        "origin_ref": j['candidate_origin_ref'],
+        "environment": j['environment'],
+        "svc_port_set_list": None,
+        "node_url_list": None,
+        "node_query_order": None,
+        "prompts": None,
+        "sync_timestamp": cur_time.isoformat()
+    }
+    return JSONResponse(response)
+
+
+# venv/lib/python3.9/site-packages/nls_services_auth/test/test_auth_controller.py
+# venv/lib/python3.9/site-packages/nls_core_auth/auth.py - CodeResponse
+@app.post('/auth/v1/code')
+async def auth_code(request: Request):
+    body = await request.body()
+    body = body.decode('utf-8')
+    j = json.loads(body)
+    # {"code_challenge":"...","origin_ref":"00112233-4455-6677-8899-aabbccddeeff"}
+    print(f'> [   code   ]: {j}')
+
+    cur_time = datetime.utcnow()
+    expires = cur_time + relativedelta(days=1)
+
+    payload = {
+        'iat': timegm(cur_time.timetuple()),
+        'exp': timegm(expires.timetuple()),
+        'challenge': j['code_challenge'],
+        'origin_ref': j['code_challenge'],
+        'key_ref': SITE_KEY_XID,
+        'kid': SITE_KEY_XID
+    }
+
+    headers = None
+    kid = payload.get('kid')
+    if kid:
+        headers = {'kid': kid}
+    key = jwk.construct(INSTANCE_KEY_RSA.export_key().decode('utf-8'), algorithm=ALGORITHMS.RS512)
+    auth_code = jws.sign(payload, key, headers=headers, algorithm='RS256')
+
+    response = {
+        "auth_code": auth_code,
+        "sync_timestamp": cur_time.isoformat(),
+        "prompts": None
+    }
+    return JSONResponse(response)
+
+
+# venv/lib/python3.9/site-packages/nls_services_auth/test/test_auth_controller.py
+# venv/lib/python3.9/site-packages/nls_core_auth/auth.py - TokenResponse
+@app.post('/auth/v1/token')
+async def auth_token(request: Request):
+    body = await request.body()
+    body = body.decode('utf-8')
+    j = json.loads(body)
+    # {"auth_code":"...","code_verifier":"..."}
+
+    # payload = self._security.get_valid_payload(req.auth_code)  # todo
+    key = jwk.construct(INSTANCE_KEY_PUB.export_key().decode('utf-8'), algorithm=ALGORITHMS.RS512)
+    payload = jwt.decode(token=j['auth_code'], key=key)
+
+    # validate the code challenge
+    if payload['challenge'] != b64encode(sha256(j['code_verifier'].encode('utf-8')).digest()).rstrip(b'=').decode('utf-8'):
+        raise HTTPException(status_code=403, detail='expected challenge did not match verifier')
+
+    cur_time = datetime.utcnow()
+    access_expires_on = cur_time + relativedelta(days=1)
+
+    new_payload = {
+        'iat': timegm(cur_time.timetuple()),
+        'nbf': timegm(cur_time.timetuple()),
+        'iss': 'https://cls.nvidia.org',
+        'aud': 'https://cls.nvidia.org',
+        'exp': timegm(access_expires_on.timetuple()),
+        'origin_ref': payload['origin_ref'],
+        'key_ref': SITE_KEY_XID,
+        'kid': SITE_KEY_XID,
+    }
+
+    headers = None
+    kid = payload.get('kid')
+    if kid:
+        headers = {'kid': kid}
+    key = jwk.construct(INSTANCE_KEY_RSA.export_key().decode('utf-8'), algorithm=ALGORITHMS.RS512)
+    auth_token = jwt.encode(new_payload, key=key, headers=headers, algorithm='RS256')
+
+    response = {
+        "expires": access_expires_on.isoformat(),
+        "auth_token": auth_token,
+        "sync_timestamp": cur_time.isoformat(),
+    }
+
+    return JSONResponse(response)
+
+
+@app.post('/leasing/v1/lessor')
+async def leasing_lessor(request: Request):
+    body = await request.body()
+    body = body.decode('utf-8')
+    j = json.loads(body)
+    # {'fulfillment_context': {'fulfillment_class_ref_list': []}, 'lease_proposal_list': [{'license_type_qualifiers': {'count': 1}, 'product': {'name': 'NVIDIA RTX Virtual Workstation'}}], 'proposal_evaluation_mode': 'ALL_OF', 'scope_ref_list': ['00112233-4455-6677-8899-aabbccddeeff']}
+    print(f'> [  lessor  ]: {j}')
+
+    cur_time = datetime.utcnow()
+    # todo: keep track of leases, to return correct list on '/leasing/v1/lessor/leases'
+    lease_result_list = []
+    for scope_ref in j['scope_ref_list']:
+        lease_result_list.append({
+            "ordinal": 0,
+            "lease": {
+                "ref": scope_ref,
+                "created": cur_time.isoformat(),
+                "expires": (cur_time + LEASE_EXPIRE_DELTA).isoformat(),
+                "recommended_lease_renewal": 0.15,
+                "offline_lease": "true",
+                "license_type": "CONCURRENT_COUNTED_SINGLE"
+            }
+        })
+
+    response = {
+        "lease_result_list": lease_result_list,
+        "result_code": "SUCCESS",
+        "sync_timestamp": cur_time.isoformat(),
+        "prompts": None
+    }
+
+    return JSONResponse(response)
+
+
+# venv/lib/python3.9/site-packages/nls_services_lease/test/test_lease_multi_controller.py
+@app.get('/leasing/v1/lessor/leases')
+async def leasing_lessor_lease(request: Request):
+    cur_time = datetime.utcnow()
+    # venv/lib/python3.9/site-packages/nls_dal_service_instance_dls/schema/service_instance/V1_0_21__product_mapping.sql
+    response = {
+        # GRID-Virtual-WS 2.0 CONCURRENT_COUNTED_SINGLE
+        "active_lease_list": [
+            "BE276D7B-2CDB-11EC-9838-061A22468B59"
+        ],
+        "sync_timestamp": cur_time.isoformat(),
+        "prompts": None
+    }
+
+    return JSONResponse(response)
+
+
+# venv/lib/python3.9/site-packages/nls_core_lease/lease_single.py
+@app.put('/leasing/v1/lease/{lease_ref}')
+async def leasing_lease_renew(request: Request, lease_ref: str):
+    print(f'> [  renew   ]: lease: {lease_ref}')
+
+    cur_time = datetime.utcnow()
+    response = {
+        "lease_ref": lease_ref,
+        "expires": (cur_time + LEASE_EXPIRE_DELTA).isoformat(),
+        "recommended_lease_renewal": 0.16,
+        "offline_lease": True,
+        "prompts": None,
+        "sync_timestamp": cur_time.isoformat(),
+    }
+
+    return JSONResponse(response)
+
+
+@app.delete('/leasing/v1/lessor/leases')
+async def leasing_lessor_lease_remove(request: Request):
+    cur_time = datetime.utcnow()
+    response = {
+        "released_lease_list": None,
+        "release_failure_list": None,
+        "sync_timestamp": cur_time.isoformat(),
+        "prompts": None
+    }
+    return JSONResponse(response)
+
+
+if __name__ == '__main__':
+    import uvicorn
+
+    ###
+    #
+    # Running `python app/main.py` assumes that the user created a keypair, e.g. with openssl.
+    #
+    # openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout app/cert/webserver.key -out app/cert/webserver.crt
+    #
+    ###
+
+    print(f'> Starting dev-server ...')
+
+    ssl_keyfile = join(dirname(__file__), 'cert/webserver.key')
+    ssl_certfile = join(dirname(__file__), 'cert/webserver.crt')
+
+    uvicorn.run('main:app', host='0.0.0.0', port=443, ssl_keyfile=ssl_keyfile, ssl_certfile=ssl_certfile, reload=True)
diff --git a/doc/Reverse Engineering Notes.md b/doc/Reverse Engineering Notes.md
new file mode 100644
index 0000000..6746cf7
--- /dev/null
+++ b/doc/Reverse Engineering Notes.md	
@@ -0,0 +1,174 @@
+# Reverse Engineering Notes
+
+# Usefully commands
+
+## Check licensing status
+
+- `nvidia-smi -q | grep "License"`
+
+**Output**
+
+```
+vGPU Software Licensed Product
+        License Status                    : Licensed (Expiry: 2023-1-14 12:59:52 GMT)
+```
+
+## Track licensing progress
+
+- NVIDIA Grid Log: `journalctl -u nvidia-gridd -f`
+
+```
+systemd[1]: Started NVIDIA Grid Daemon.
+nvidia-gridd[2986]: Configuration parameter ( ServerAddress  ) not set
+nvidia-gridd[2986]: vGPU Software package (0)
+nvidia-gridd[2986]: Ignore service provider and node-locked licensing
+nvidia-gridd[2986]: NLS initialized
+nvidia-gridd[2986]: Acquiring license. (Info: license.nvidia.space; NVIDIA RTX Virtual Workstation)
+nvidia-gridd[2986]: License acquired successfully. (Info: license.nvidia.space, NVIDIA RTX Virtual Workstation; Expiry: 2023-1-29 22:3:0 GMT)
+```
+
+# DLS-Container File-System (Docker)
+
+## Configuration data
+
+Most variables and configs are stored in `/var/lib/docker/volumes/configurations/_data`.
+
+## Dive / Docker image inspector
+
+- `dive dls:appliance`
+
+The source code is stored in `/venv/lib/python3.9/site-packages/nls_*`.
+
+Image-Reference:
+
+```
+Tags:   (unavailable)
+Id:     d1c7976a5d2b3681ff6c5a30f8187e4015187a83f3f285ba4a37a45458bd6b98
+Digest: sha256:311223c5af7a298ec1104f5dc8c3019bfb0e1f77256dc3d995244ffb295a97
+1f
+Command:
+#(nop) ADD file:c1900d3e3a29c29a743a8da86c437006ec5d2aa873fb24e48033b6bf492bb37b in /
+```
+
+## Private Key (Site-Key)
+
+- `/etc/dls/config/decryptor/decryptor`
+
+```shell
+ docker exec -it <container-id> /etc/dls/config/decryptor/decryptor > /tmp/private-key.pem
+```
+
+```
+-----BEGIN RSA PRIVATE KEY-----
+...
+-----END RSA PRIVATE KEY-----
+``` 
+
+## Site Key Uri - `/etc/dls/config/site_key_uri.bin`
+
+```
+base64-content...
+```
+
+## DB Password - `/etc/dls/config/dls_db_password.bin`
+
+```
+base64-content...
+```
+
+**Decrypt database password**
+
+```
+cd /var/lib/docker/volumes/configurations/_data
+cat dls_db_password.bin | base64 -d > dls_db_password.bin.raw
+openssl rsautl -decrypt -inkey /tmp/private-key.pem -in dls_db_password.bin.raw
+```
+
+# Database
+
+- It's enough to manipulate database licenses. There must not be changed any line of code to bypass licensing
+  validations.
+
+# Logging / Stack Trace
+
+- https://docs.nvidia.com/license-system/latest/nvidia-license-system-user-guide/index.html#troubleshooting-dls-instance
+
+**Failed licensing log**
+
+```
+{
+    "activity": 100,
+    "context": {
+        "SERVICE_INSTANCE_ID": "b43d6e46-d6d0-4943-8b8d-c66a5f6e0d38",
+        "SERVICE_INSTANCE_NAME": "DEFAULT_2022-12-14_12:48:30",
+        "description": "borrow failed: NotFoundError(no pool features found for: NVIDIA RTX Virtual Workstation)",
+        "event_type": null,
+        "function_name": "_evt",
+        "lineno": 54,
+        "module_name": "nls_dal_lease_dls.event",
+        "operation_id": "e72a8ca7-34cc-4e11-b80c-273592085a24",
+        "origin_ref": "3f7f5a50-a26b-425b-8d5e-157f63e72b1c",
+        "service_name": "nls_services_lease"
+    },
+    "detail": {
+        "oc": {
+            "license_allotment_xid": "10c4317f-7c4c-11ed-a524-0e4252a7e5f1",
+            "origin_ref": "3f7f5a50-a26b-425b-8d5e-157f63e72b1c",
+            "service_instance_xid": "b43d6e46-d6d0-4943-8b8d-c66a5f6e0d38"
+        },
+        "operation_id": "e72a8ca7-34cc-4e11-b80c-273592085a24"
+    },
+    "id": "0cc9e092-3b92-4652-8d9e-7622ef85dc79",
+    "metadata": {},
+    "ts": "2022-12-15T10:25:36.827661Z"
+}
+
+{
+    "activity": 400,
+    "context": {
+        "SERVICE_INSTANCE_ID": "b43d6e46-d6d0-4943-8b8d-c66a5f6e0d38",
+        "SERVICE_INSTANCE_NAME": "DEFAULT_2022-12-14_12:48:30",
+        "description": "lease_multi_create failed: no pool features found for: NVIDIA RTX Virtual Workstation",
+        "event_by": "system",
+        "function_name": "lease_multi_create",
+        "level": "warning",
+        "lineno": 157,
+        "module_name": "nls_services_lease.controllers.lease_multi_controller",
+        "operation_id": "e72a8ca7-34cc-4e11-b80c-273592085a24",
+        "service_name": "nls_services_lease"
+    },
+    "detail": {
+        "_msg": "lease_multi_create failed: no pool features found for: NVIDIA RTX Virtual Workstation",
+        "exec_info": ["NotFoundError", "NotFoundError(no pool features found for: NVIDIA RTX Virtual Workstation)", "  File \"/venv/lib/python3.9/site-packages/nls_services_lease/controllers/lease_multi_controller.py\", line 127, in lease_multi_create\n    data = _leaseMulti.lease_multi_create(event_args)\n  File \"/venv/lib/python3.9/site-packages/nls_core_lease/lease_multi.py\", line 208, in lease_multi_create\n    raise e\n  File \"/venv/lib/python3.9/site-packages/nls_core_lease/lease_multi.py\", line 184, in lease_multi_create\n    self._try_proposals(oc, mlr, results, detail)\n  File \"/venv/lib/python3.9/site-packages/nls_core_lease/lease_multi.py\", line 219, in _try_proposals\n    lease = self._leases.create(creator)\n  File \"/venv/lib/python3.9/site-packages/nls_dal_lease_dls/leases.py\", line 230, in create\n    features = self._get_features(creator)\n  File \"/venv/lib/python3.9/site-packages/nls_dal_lease_dls/leases.py\", line 148, in _get_features\n    self._explain_not_available(cur, creator)\n  File \"/venv/lib/python3.9/site-packages/nls_dal_lease_dls/leases.py\", line 299, in _explain_not_available\n    raise NotFoundError(f'no pool features found for: {lcc.product_name}')\n"],
+        "operation_id": "e72a8ca7-34cc-4e11-b80c-273592085a24"
+    },
+    "id": "282801b9-d612-40a5-9145-b56d8e420dac",
+    "metadata": {},
+    "ts": "2022-12-15T10:25:36.831673Z"
+}
+
+```
+
+**Stack Trace**
+
+```
+"NotFoundError", "NotFoundError(no pool features found for: NVIDIA RTX Virtual Workstation)", "  File \"/venv/lib/python3.9/site-packages/nls_services_lease/controllers/lease_multi_controller.py\", line 127, in lease_multi_create
+    data = _leaseMulti.lease_multi_create(event_args)
+  File \"/venv/lib/python3.9/site-packages/nls_core_lease/lease_multi.py\", line 208, in lease_multi_create
+    raise e
+  File \"/venv/lib/python3.9/site-packages/nls_core_lease/lease_multi.py\", line 184, in lease_multi_create
+    self._try_proposals(oc, mlr, results, detail)
+  File \"/venv/lib/python3.9/site-packages/nls_core_lease/lease_multi.py\", line 219, in _try_proposals
+    lease = self._leases.create(creator)
+  File \"/venv/lib/python3.9/site-packages/nls_dal_lease_dls/leases.py\", line 230, in create
+    features = self._get_features(creator)
+  File \"/venv/lib/python3.9/site-packages/nls_dal_lease_dls/leases.py\", line 148, in _get_features
+    self._explain_not_available(cur, creator)
+  File \"/venv/lib/python3.9/site-packages/nls_dal_lease_dls/leases.py\", line 299, in _explain_not_available
+    raise NotFoundError(f'no pool features found for: {lcc.product_name}')
+"
+```
+
+# Nginx
+
+- NGINX uses `/opt/certs/cert.pem` and `/opt/certs/key.pem`  
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..d0361f2
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,5 @@
+fastapi==0.88.0
+uvicorn[standard]==0.20.0
+python-jose==3.3.0
+pycryptodome==3.16.0
+python-dateutil==2.8.2