diff --git a/.cz.yaml b/.cz.yaml
index 80000d88532d781ea18c980aa342a96b1d12f4d7..1fbd3d08d2009f771eabe693366acc37c4d0063c 100644
--- a/.cz.yaml
+++ b/.cz.yaml
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2022 Stefan Hynek
+#
+# SPDX-License-Identifier: CC0-1.0
+
 commitizen:
   name: cz_conventional_commits
   version: 0.1.0
diff --git a/.dockerignore b/.dockerignore
index f7275bbbd035b827023cbae18954c0703b200c34..d111f543367b46cbb9201b97c9fe4beb7de99540 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1 +1,5 @@
+# SPDX-FileCopyrightText: 2022 Stefan Hynek
+#
+# SPDX-License-Identifier: CC0-1.0
+
 venv/
diff --git a/.gitignore b/.gitignore
index 9a53e7b6c346dca27ea30eadbfc7877af6a2a018..3f819487ceb5e6e964afd87734874edddf9c7aa4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: 2022 Stefan Hynek
+#
+# SPDX-License-Identifier: CC0-1.0
+
 __pycache__
 .env
+node_modules
 venv/
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9e2cd0d33667e60c7531664d683e65d81b17dc46..cdb1d73bf186c9608bcc6c88a193765ee52f5835 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2022 Stefan Hynek
+#
+# SPDX-License-Identifier: CC0-1.0
+
 ---
 workflow:
   rules:
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 2b0268e796d4355460ff61518bd498a20c1c1fec..7cdb1ae89770b5b85acaf4b24b0accbabcefbf13 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2022 Stefan Hynek
+#
+# SPDX-License-Identifier: CC0-1.0
+
 repos:
 - hooks:
   - id: trailing-whitespace
diff --git a/.pylintrc b/.pylintrc
new file mode 100644
index 0000000000000000000000000000000000000000..9f82509cc9507a28737259b9f87148ad642358b2
--- /dev/null
+++ b/.pylintrc
@@ -0,0 +1,564 @@
+# SPDX-FileCopyrightText: 2022 Stefan Hynek
+#
+# SPDX-License-Identifier: CC0-1.0
+
+[MASTER]
+
+# A comma-separated list of package or module names from where C extensions may
+# be loaded. Extensions are loading into the active Python interpreter and may
+# run arbitrary code.
+extension-pkg-allow-list=
+
+# A comma-separated list of package or module names from where C extensions may
+# be loaded. Extensions are loading into the active Python interpreter and may
+# run arbitrary code. (This is an alternative name to extension-pkg-allow-list
+# for backward compatibility.)
+extension-pkg-whitelist=
+
+# Return non-zero exit code if any of these messages/categories are detected,
+# even if score is above --fail-under value. Syntax same as enable. Messages
+# specified are enabled, while categories only check already-enabled messages.
+fail-on=
+
+# Specify a score threshold to be exceeded before program exits with error.
+fail-under=10.0
+
+# Files or directories to be skipped. They should be base names, not paths.
+ignore=CVS
+
+# Add files or directories matching the regex patterns to the ignore-list. The
+# regex matches against paths.
+ignore-paths=
+
+# Files or directories matching the regex patterns are skipped. The regex
+# matches against base names, not paths.
+ignore-patterns=
+
+# Python code to execute, usually for sys.path manipulation such as
+# pygtk.require().
+#init-hook=
+
+# Use multiple processes to speed up Pylint. Specifying 0 will auto-detect the
+# number of processors available to use.
+jobs=1
+
+# Control the amount of potential inferred values when inferring a single
+# object. This can help the performance when dealing with large functions or
+# complex, nested conditions.
+limit-inference-results=100
+
+# List of plugins (as comma separated values of python module names) to load,
+# usually to register additional checkers.
+load-plugins=
+
+# Pickle collected data for later comparisons.
+persistent=yes
+
+# Min Python version to use for version dependend checks. Will default to the
+# version used to run pylint.
+py-version=3.8
+
+# When enabled, pylint would attempt to guess common misconfiguration and emit
+# user-friendly hints instead of false-positive error messages.
+suggestion-mode=yes
+
+# Allow loading of arbitrary C extensions. Extensions are imported into the
+# active Python interpreter and may run arbitrary code.
+unsafe-load-any-extension=no
+
+
+[MESSAGES CONTROL]
+
+# Only show warnings with the listed confidence levels. Leave empty to show
+# all. Valid levels: HIGH, INFERENCE, INFERENCE_FAILURE, UNDEFINED.
+confidence=
+
+# Disable the message, report, category or checker with the given id(s). You
+# can either give multiple identifiers separated by comma (,) or put this
+# option multiple times (only on the command line, not in the configuration
+# file where it should appear only once). You can also use "--disable=all" to
+# disable everything first and then reenable specific checks. For example, if
+# you want to run only the similarities checker, you can use "--disable=all
+# --enable=similarities". If you want to run only the classes checker, but have
+# no Warning level messages displayed, use "--disable=all --enable=classes
+# --disable=W".
+disable=raw-checker-failed,
+        bad-inline-option,
+        locally-disabled,
+        file-ignored,
+        suppressed-message,
+        useless-suppression,
+        deprecated-pragma,
+        use-symbolic-message-instead
+
+# Enable the message, report, category or checker with the given id(s). You can
+# either give multiple identifier separated by comma (,) or put this option
+# multiple time (only on the command line, not in the configuration file where
+# it should appear only once). See also the "--disable" option for examples.
+enable=c-extension-no-member
+
+
+[REPORTS]
+
+# Python expression which should return a score less than or equal to 10. You
+# have access to the variables 'error', 'warning', 'refactor', and 'convention'
+# which contain the number of messages in each category, as well as 'statement'
+# which is the total number of statements analyzed. This score is used by the
+# global evaluation report (RP0004).
+evaluation=10.0 - ((float(5 * error + warning + refactor + convention) / statement) * 10)
+
+# Template used to display messages. This is a python new-style format string
+# used to format the message information. See doc for all details.
+#msg-template=
+
+# Set the output format. Available formats are text, parseable, colorized, json
+# and msvs (visual studio). You can also give a reporter class, e.g.
+# mypackage.mymodule.MyReporterClass.
+output-format=text
+
+# Tells whether to display a full report or only the messages.
+reports=no
+
+# Activate the evaluation score.
+score=yes
+
+
+[REFACTORING]
+
+# Maximum number of nested blocks for function / method body
+max-nested-blocks=5
+
+# Complete name of functions that never returns. When checking for
+# inconsistent-return-statements if a never returning function is called then
+# it will be considered as an explicit return statement and no message will be
+# printed.
+never-returning-functions=sys.exit,argparse.parse_error
+
+
+[VARIABLES]
+
+# List of additional names supposed to be defined in builtins. Remember that
+# you should avoid defining new builtins when possible.
+additional-builtins=
+
+# Tells whether unused global variables should be treated as a violation.
+allow-global-unused-variables=yes
+
+# List of names allowed to shadow builtins
+allowed-redefined-builtins=
+
+# List of strings which can identify a callback function by name. A callback
+# name must start or end with one of those strings.
+callbacks=cb_,
+          _cb
+
+# A regular expression matching the name of dummy variables (i.e. expected to
+# not be used).
+dummy-variables-rgx=_+$|(_[a-zA-Z0-9_]*[a-zA-Z0-9]+?$)|dummy|^ignored_|^unused_
+
+# Argument names that match this expression will be ignored. Default to name
+# with leading underscore.
+ignored-argument-names=_.*|^ignored_|^unused_
+
+# Tells whether we should check for unused import in __init__ files.
+init-import=no
+
+# List of qualified module names which can have objects that can redefine
+# builtins.
+redefining-builtins-modules=six.moves,past.builtins,future.builtins,builtins,io
+
+
+[BASIC]
+
+# Naming style matching correct argument names.
+argument-naming-style=snake_case
+
+# Regular expression matching correct argument names. Overrides argument-
+# naming-style.
+#argument-rgx=
+
+# Naming style matching correct attribute names.
+attr-naming-style=snake_case
+
+# Regular expression matching correct attribute names. Overrides attr-naming-
+# style.
+#attr-rgx=
+
+# Bad variable names which should always be refused, separated by a comma.
+bad-names=foo,
+          bar,
+          baz,
+          toto,
+          tutu,
+          tata
+
+# Bad variable names regexes, separated by a comma. If names match any regex,
+# they will always be refused
+bad-names-rgxs=
+
+# Naming style matching correct class attribute names.
+class-attribute-naming-style=any
+
+# Regular expression matching correct class attribute names. Overrides class-
+# attribute-naming-style.
+#class-attribute-rgx=
+
+# Naming style matching correct class constant names.
+class-const-naming-style=UPPER_CASE
+
+# Regular expression matching correct class constant names. Overrides class-
+# const-naming-style.
+#class-const-rgx=
+
+# Naming style matching correct class names.
+class-naming-style=PascalCase
+
+# Regular expression matching correct class names. Overrides class-naming-
+# style.
+#class-rgx=
+
+# Naming style matching correct constant names.
+const-naming-style=UPPER_CASE
+
+# Regular expression matching correct constant names. Overrides const-naming-
+# style.
+#const-rgx=
+
+# Minimum line length for functions/classes that require docstrings, shorter
+# ones are exempt.
+docstring-min-length=-1
+
+# Naming style matching correct function names.
+function-naming-style=snake_case
+
+# Regular expression matching correct function names. Overrides function-
+# naming-style.
+#function-rgx=
+
+# Good variable names which should always be accepted, separated by a comma.
+good-names=i,
+           j,
+           k,
+           ex,
+           Run,
+           _
+
+# Good variable names regexes, separated by a comma. If names match any regex,
+# they will always be accepted
+good-names-rgxs=
+
+# Include a hint for the correct naming format with invalid-name.
+include-naming-hint=no
+
+# Naming style matching correct inline iteration names.
+inlinevar-naming-style=any
+
+# Regular expression matching correct inline iteration names. Overrides
+# inlinevar-naming-style.
+#inlinevar-rgx=
+
+# Naming style matching correct method names.
+method-naming-style=snake_case
+
+# Regular expression matching correct method names. Overrides method-naming-
+# style.
+#method-rgx=
+
+# Naming style matching correct module names.
+module-naming-style=snake_case
+
+# Regular expression matching correct module names. Overrides module-naming-
+# style.
+#module-rgx=
+
+# Colon-delimited sets of names that determine each other's naming style when
+# the name regexes allow several styles.
+name-group=
+
+# Regular expression which should only match function or class names that do
+# not require a docstring.
+no-docstring-rgx=^_
+
+# List of decorators that produce properties, such as abc.abstractproperty. Add
+# to this list to register other decorators that produce valid properties.
+# These decorators are taken in consideration only for invalid-name.
+property-classes=abc.abstractproperty
+
+# Naming style matching correct variable names.
+variable-naming-style=snake_case
+
+# Regular expression matching correct variable names. Overrides variable-
+# naming-style.
+#variable-rgx=
+
+
+[FORMAT]
+
+# Expected format of line ending, e.g. empty (any line ending), LF or CRLF.
+expected-line-ending-format=
+
+# Regexp for a line that is allowed to be longer than the limit.
+ignore-long-lines=^\s*(# )?<?https?://\S+>?$
+
+# Number of spaces of indent required inside a hanging or continued line.
+indent-after-paren=4
+
+# String used as indentation unit. This is usually "    " (4 spaces) or "\t" (1
+# tab).
+indent-string='    '
+
+# Maximum number of characters on a single line.
+max-line-length=88
+
+# Maximum number of lines in a module.
+max-module-lines=1000
+
+# Allow the body of a class to be on the same line as the declaration if body
+# contains single statement.
+single-line-class-stmt=no
+
+# Allow the body of an if to be on the same line as the test if there is no
+# else.
+single-line-if-stmt=no
+
+
+[SIMILARITIES]
+
+# Comments are removed from the similarity computation
+ignore-comments=yes
+
+# Docstrings are removed from the similarity computation
+ignore-docstrings=yes
+
+# Imports are removed from the similarity computation
+ignore-imports=no
+
+# Signatures are removed from the similarity computation
+ignore-signatures=no
+
+# Minimum lines number of a similarity.
+min-similarity-lines=4
+
+
+[SPELLING]
+
+# Limits count of emitted suggestions for spelling mistakes.
+max-spelling-suggestions=4
+
+# Spelling dictionary name. Available dictionaries: none. To make it work,
+# install the 'python-enchant' package.
+spelling-dict=
+
+# List of comma separated words that should be considered directives if they
+# appear and the beginning of a comment and should not be checked.
+spelling-ignore-comment-directives=fmt: on,fmt: off,noqa:,noqa,nosec,isort:skip,mypy:
+
+# List of comma separated words that should not be checked.
+spelling-ignore-words=
+
+# A path to a file that contains the private dictionary; one word per line.
+spelling-private-dict-file=
+
+# Tells whether to store unknown words to the private dictionary (see the
+# --spelling-private-dict-file option) instead of raising a message.
+spelling-store-unknown-words=no
+
+
+[STRING]
+
+# This flag controls whether inconsistent-quotes generates a warning when the
+# character used as a quote delimiter is used inconsistently within a module.
+check-quote-consistency=yes
+
+# This flag controls whether the implicit-str-concat should generate a warning
+# on implicit string concatenation in sequences defined over several lines.
+check-str-concat-over-line-jumps=yes
+
+
+[LOGGING]
+
+# The type of string formatting that logging methods do. `old` means using %
+# formatting, `new` is for `{}` formatting.
+logging-format-style=old
+
+# Logging modules to check that the string format arguments are in logging
+# function parameter format.
+logging-modules=logging
+
+
+[TYPECHECK]
+
+# List of decorators that produce context managers, such as
+# contextlib.contextmanager. Add to this list to register other decorators that
+# produce valid context managers.
+contextmanager-decorators=contextlib.contextmanager
+
+# List of members which are set dynamically and missed by pylint inference
+# system, and so shouldn't trigger E1101 when accessed. Python regular
+# expressions are accepted.
+generated-members=
+
+# Tells whether missing members accessed in mixin class should be ignored. A
+# mixin class is detected if its name ends with "mixin" (case insensitive).
+ignore-mixin-members=yes
+
+# Tells whether to warn about missing members when the owner of the attribute
+# is inferred to be None.
+ignore-none=yes
+
+# This flag controls whether pylint should warn about no-member and similar
+# checks whenever an opaque object is returned when inferring. The inference
+# can return multiple potential results while evaluating a Python object, but
+# some branches might not be evaluated, which results in partial inference. In
+# that case, it might be useful to still emit no-member and other checks for
+# the rest of the inferred objects.
+ignore-on-opaque-inference=yes
+
+# List of class names for which member attributes should not be checked (useful
+# for classes with dynamically set attributes). This supports the use of
+# qualified names.
+ignored-classes=optparse.Values,thread._local,_thread._local
+
+# List of module names for which member attributes should not be checked
+# (useful for modules/projects where namespaces are manipulated during runtime
+# and thus existing member attributes cannot be deduced by static analysis). It
+# supports qualified module names, as well as Unix pattern matching.
+ignored-modules=
+
+# Show a hint with possible names when a member name was not found. The aspect
+# of finding the hint is based on edit distance.
+missing-member-hint=yes
+
+# The minimum edit distance a name should have in order to be considered a
+# similar match for a missing member name.
+missing-member-hint-distance=1
+
+# The total number of similar names that should be taken in consideration when
+# showing a hint for a missing member.
+missing-member-max-choices=1
+
+# List of decorators that change the signature of a decorated function.
+signature-mutators=
+
+
+[MISCELLANEOUS]
+
+# List of note tags to take in consideration, separated by a comma.
+notes=FIXME,
+      XXX,
+      TODO
+
+# Regular expression of note tags to take in consideration.
+#notes-rgx=
+
+
+[IMPORTS]
+
+# List of modules that can be imported at any level, not just the top level
+# one.
+allow-any-import-level=
+
+# Allow wildcard imports from modules that define __all__.
+allow-wildcard-with-all=no
+
+# Analyse import fallback blocks. This can be used to support both Python 2 and
+# 3 compatible code, which means that the block might have code that exists
+# only in one or another interpreter, leading to false positives when analysed.
+analyse-fallback-blocks=no
+
+# Deprecated modules which should not be used, separated by a comma.
+deprecated-modules=
+
+# Output a graph (.gv or any supported image format) of external dependencies
+# to the given file (report RP0402 must not be disabled).
+ext-import-graph=
+
+# Output a graph (.gv or any supported image format) of all (i.e. internal and
+# external) dependencies to the given file (report RP0402 must not be
+# disabled).
+import-graph=
+
+# Output a graph (.gv or any supported image format) of internal dependencies
+# to the given file (report RP0402 must not be disabled).
+int-import-graph=
+
+# Force import order to recognize a module as part of the standard
+# compatibility libraries.
+known-standard-library=
+
+# Force import order to recognize a module as part of a third party library.
+known-third-party=enchant
+
+# Couples of modules and preferred modules, separated by a comma.
+preferred-modules=
+
+
+[CLASSES]
+
+# Warn about protected attribute access inside special methods
+check-protected-access-in-special-methods=no
+
+# List of method names used to declare (i.e. assign) instance attributes.
+defining-attr-methods=__init__,
+                      __new__,
+                      setUp,
+                      __post_init__
+
+# List of member names, which should be excluded from the protected access
+# warning.
+exclude-protected=_asdict,
+                  _fields,
+                  _replace,
+                  _source,
+                  _make
+
+# List of valid names for the first argument in a class method.
+valid-classmethod-first-arg=cls
+
+# List of valid names for the first argument in a metaclass class method.
+valid-metaclass-classmethod-first-arg=cls
+
+
+[DESIGN]
+
+# List of qualified class names to ignore when counting class parents (see
+# R0901)
+ignored-parents=
+
+# Maximum number of arguments for function / method.
+max-args=5
+
+# Maximum number of attributes for a class (see R0902).
+max-attributes=7
+
+# Maximum number of boolean expressions in an if statement (see R0916).
+max-bool-expr=5
+
+# Maximum number of branch for function / method body.
+max-branches=12
+
+# Maximum number of locals for function / method body.
+max-locals=15
+
+# Maximum number of parents for a class (see R0901).
+max-parents=7
+
+# Maximum number of public methods for a class (see R0904).
+max-public-methods=20
+
+# Maximum number of return / yield for function / method body.
+max-returns=6
+
+# Maximum number of statements in function / method body.
+max-statements=50
+
+# Minimum number of public methods for a class (see R0903).
+min-public-methods=2
+
+
+[EXCEPTIONS]
+
+# Exceptions that will emit a warning when being caught. Defaults to
+# "BaseException, Exception".
+overgeneral-exceptions=BaseException,
+                       Exception
diff --git a/.vscode/launch.json.license b/.vscode/launch.json.license
new file mode 100644
index 0000000000000000000000000000000000000000..fdd7b8f63f0fd98462577d3d997814f8836e7fb0
--- /dev/null
+++ b/.vscode/launch.json.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2022 Stefan Hynek
+
+SPDX-License-Identifier: CC0-1.0
diff --git a/.vscode/settings.json.license b/.vscode/settings.json.license
new file mode 100644
index 0000000000000000000000000000000000000000..fdd7b8f63f0fd98462577d3d997814f8836e7fb0
--- /dev/null
+++ b/.vscode/settings.json.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2022 Stefan Hynek
+
+SPDX-License-Identifier: CC0-1.0
diff --git a/Dockerfile b/Dockerfile
index 0e3e7b86e25e078a211f6301e5b05bed901c1d39..687aade4a5b3c125c9ac3fed11751b668145586c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2022 Stefan Hynek
+#
+# SPDX-License-Identifier: CC0-1.0
+
 # syntax=docker/dockerfile:1
 FROM python:3.8-alpine
 
diff --git a/README.md b/README.md
index 293ea7cd43665620c03a3a31816c3bf0edf9dbfd..0f04e36602941112691512188b766202a1f844be 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
+<!--
+SPDX-FileCopyrightText: 2022 Stefan Hynek
+
+SPDX-License-Identifier: CC0-1.0
+-->
+
 # repdav
 
 ## Development
@@ -16,7 +22,7 @@
 1. Install requirements.
 
     ```sh
-    pip install $(cat requirements.txt requirements.dev.txt)
+    pip install -r requirements.txt -r requirements.dev.txt
     ```
 
 1. Configure the service by setting the following variables either in your environment or in the `docker-compose.yml` file.
@@ -28,7 +34,7 @@
 1. Start the service.
 
     ```sh
-    python main.py
+    python src/main.py
     ```
 
 For your convenience, a Docker Compose setup is delivered with this repository that configures the service accordingly. Build and start the stack.
diff --git a/docker-compose.yml b/docker-compose.yml
index 79bdbc3ab368a86eb559909aaaac488dea3b1d59..1940fb09c018a71b3666e05af618c542d5661989 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2022 Stefan Hynek
+#
+# SPDX-License-Identifier: CC0-1.0
+
 ---
 version: '3.4'
 
diff --git a/package-lock.json.license b/package-lock.json.license
new file mode 100644
index 0000000000000000000000000000000000000000..fdd7b8f63f0fd98462577d3d997814f8836e7fb0
--- /dev/null
+++ b/package-lock.json.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2022 Stefan Hynek
+
+SPDX-License-Identifier: CC0-1.0
diff --git a/package.json.license b/package.json.license
new file mode 100644
index 0000000000000000000000000000000000000000..fdd7b8f63f0fd98462577d3d997814f8836e7fb0
--- /dev/null
+++ b/package.json.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2022 Stefan Hynek
+
+SPDX-License-Identifier: CC0-1.0
diff --git a/requirements.dev.txt b/requirements.dev.txt
index a8ca70e3797f76ee2b0c1eaccd4fca1c5cef3e1d..629511d8d1ec7af594a1e6c832490bade229284f 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -1,8 +1,12 @@
-autopep8==1.5.7
+# SPDX-FileCopyrightText: 2022 Stefan Hynek
+#
+# SPDX-License-Identifier: CC0-1.0
+
+-e ../tgclients/
 bandit==1.7.0
+black==22.1.0
 commitizen==2.20.0
 mypy==0.910
 pre-commit==2.15.0
 pylint==2.11.1
-rstcheck==3.3.1
-types-requests==2.25.11
+reuse==0.14.0
diff --git a/requirements.txt b/requirements.txt
index 8a632eef06323e0408f3db251c9d3592ab487007..eac497cda498dbcdb66146a1a9fb641bdf77e479 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2022 Stefan Hynek
+#
+# SPDX-License-Identifier: CC0-1.0
+
 https://gitlab.gwdg.de/dariah-de/textgridrep/textgrid-python-clients/-/archive/ef48104e96ce045bce3702116171442c9f02a0be/textgrid-python-clients-ef48104e96ce045bce3702116171442c9f02a0be.tar.gz
 cheroot==8.5.2
 sentry-sdk==1.4.3