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diff --git a/src/hydrilla/versions.py b/src/hydrilla/versions.py
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+++ b/src/hydrilla/versions.py
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+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# Functions to operate on version numbers.
+#
+# This file is part of Hydrilla&Haketilo.
+#
+# Copyright (C) 2021, 2022 Wojtek Kosior
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+#
+# I, Wojtek Kosior, thereby promise not to sue for violation of this
+# file's license. Although I request that you do not make use this code
+# in a proprietary program, I am not going to enforce this in court.
+
+"""
+This module contains functions for deconstruction and construction of version
+strings and version tuples.
+"""
+
+# Enable using with Python 3.7.
+from __future__ import annotations
+
+import typing as t
+
+def normalize_version(ver: t.Sequence[int]) -> tuple[int, ...]:
+    """Strip right-most zeroes from 'ver'. The original list is not modified."""
+    new_len = 0
+    for i, num in enumerate(ver):
+        if num != 0:
+            new_len = i + 1
+
+    return tuple(ver[:new_len])
+
+def parse_version(ver_str: str) -> tuple[int, ...]:
+    """
+    Convert 'ver_str' into an array representation, e.g. for ver_str="4.6.13.0"
+    return [4, 6, 13, 0].
+    """
+    return tuple(int(num) for num in ver_str.split('.'))
+
+def version_string(ver: t.Sequence[int], rev: t.Optional[int] = None) -> str:
+    """
+    Produce version's string representation (optionally with revision), like:
+        1.2.3-5
+    No version normalization is performed.
+    """
+    return '.'.join(str(n) for n in ver) + ('' if rev is None else f'-{rev}')