Lesson 4 · boundaries

Static, dynamic and relinkable

A shared library must be meaningfully replaceable.

LGPL is not simply a rule that dynamic linking is safe and static linking is forbidden. Its combined-work permissions have conditions. A suitable shared-library mechanism must permit an interface-compatible modified library to work.

With static linking, providing suitable application object code can let recipients recombine or relink against a modified library. Applicable installation information and permission to debug modifications may also matter. Supplying a library URL alone does not establish those capabilities.

This scenario supplies a narrow, explicit relinking contract. Its evidence artifact records either a compatible replacement mechanism or relinkable objects, plus the permission to debug library modifications. This declaration is a simulation input; a real release would need the actual corresponding artifacts.

Read the primary terms and guidance ↗

Try it: A replaceable library

The LGPL library is dynamically linked. Its source location is included, but the application has no documented compatible replacement mechanism or debugging permission.

Before inspecting the result

What does this supplied release need before its modeled requirements are met?

Already meets the requirementsA concrete repairAdditional evidence or a license choice

Project boundary

2 components

Dependency relationships
From → to	Connection	Semantics
app → library	dynamic	intimate

Supplied facts

Distribution: binary
Network interaction: No
Intended use: internal
Evaluation date: 2026-10-24
Policy: learning

These facts define the simulation. Evidence declarations stand in for actual corresponding source, relinkable objects and release materials.

Components

Inspect component

Declared license: LicenseRef-Proprietary
Modified files: None
Artifact: code

Third-party grants remain fixed unless this scenario supplies authority to change them.

Project artifacts

Format library 1.0.0

GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007

Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.

This version of the GNU Lesser General Public License incorporates the terms and conditions of version 3 of the GNU General Public License, supplemented by the additional permissions listed below.

0. Additional Definitions.

As used herein, "this License" refers to version 3 of the GNU Lesser General Public License, and the "GNU GPL" refers to version 3 of the GNU General Public License.

"The Library" refers to a covered work governed by this License, other than an Application or a Combined Work as defined below.

An "Application" is any work that makes use of an interface provided by the Library, but which is not otherwise based on the Library. Defining a subclass of a class defined by the Library is deemed a mode of using an interface provided by the Library.

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If you modify a copy of the Library, and, in your modifications, a facility refers to a function or data to be supplied by an Application that uses the facility (other than as an argument passed when the facility is invoked), then you may convey a copy of the modified version:

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If the Library as you received it specifies that a proxy can decide whether future versions of the GNU Lesser General Public License shall
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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007

Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.

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THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee.

END OF TERMS AND CONDITIONS

How to Apply These Terms to Your New Programs

If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.

To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the “copyright” line and a pointer to where the full notice is found.

<one line to give the program's name and a brief idea of what it does.>
     Copyright (C) <year>  <name of author>

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 <http://www.gnu.org/licenses/>.

Also add information on how to contact you by electronic and paper mail.

If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:

<program>  Copyright (C) <year>  <name of author>
     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
     This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an “about box”.

You should also get your employer (if you work as a programmer) or school, if any, to sign a “copyright disclaimer” for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see <http://www.gnu.org/licenses/>.

The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read <http://www.gnu.org/philosophy/why-not-lgpl.html>.

Evidence artifact format

Source offers contain “component: id” and “source: https://…” on separate lines. Covered-file offers also list the covered paths. Relinking declarations contain “replace-compatible-library” for dynamic linking or “relink-object-files” for static linking, and “reverse-engineering-permitted”. These declarations model supplied release artifacts.

License reference

permissions: commercial-use, modifications, distribution, private-use
conditions: include-copyright, include-license
limitations: liability, warranty

Read authoritative terms ↗

Expression builder

SPDX expression

Each row is one selectable alternative. AND retains every term in a row.
Alternative	Required licenses
1	MIT AND LGPL-3.0-only
2	Apache-2.0 AND LGPL-3.0-only

Results appear after submission.