Creative Commons Attribution 4.0 International (CC BY 4.0)

This is a human-readable summary of (and not a substitute for) the license.
https://creativecommons.org/licenses/by/4.0/legalcode

You are free to:

Share — copy and redistribute the material in any medium or format
Adapt — remix, transform, and build upon the material for any purpose,
even commercially.

Under the following terms:

Attribution — You must give appropriate credit, provide a link to the
license, and indicate if changes were made. You may do so
in any reasonable manner, but not in any way that suggests
the licensor endorses you or your use.

No additional restrictions — You may not apply legal terms or technological
measures that legally restrict others from
doing anything the license permits.

Notices:

You do not have to comply with the license for elements of the material
in the public domain or where your use is permitted by an applicable
exception or limitation.

No warranties are given. The license may not give you all of the
permissions necessary for your intended use. For example, other rights
such as publicity, privacy, or moral rights may limit how you use the
material.

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# FULL LICENSE TEXT

Creative Commons Attribution 4.0 International

Creative Commons Corporation ("Creative Commons") is not a law firm and does
not provide legal services or legal advice. Distribution of Creative Commons
public licenses does not create a lawyer-client or other relationship.
Creative Commons makes its licenses and related information available on an
"as-is" basis. Creative Commons gives no warranties regarding its licenses,
any material licensed under their terms and conditions, or any related
information. Creative Commons disclaims all liability for damages resulting
from their use to the fullest extent possible.

Using Creative Commons Public Licenses

Creative Commons public licenses provide a standard set of terms and
conditions that creators and other rights holders may use to share original
works of authorship and other material subject to copyright and certain other
rights specified in the public license below. The following considerations
are for informational purposes only, are not exhaustive, and do not form part
of our licenses.

Section 1 – Definitions.

a. Adapted Material means material subject to Copyright and Similar Rights
that is derived from or based upon the Licensed Material and in which the
Licensed Material is translated, altered, arranged, transformed, or
otherwise modified in a manner requiring permission under the Copyright
and Similar Rights held by the Licensor.

b. Adapter's License means the license You apply to Your Copyright and
Similar Rights in Your contributions to Adapted Material in accordance
with the terms and conditions of this Public License.

c. Copyright and Similar Rights means copyright and/or similar rights closely
related to copyright including, without limitation, performance, broadcast,
sound recording, and Sui Generis Database Rights, without regard to how
the rights are labeled or categorized.

d. Licensed Material means the artistic or literary work, database, or other
material to which the Licensor applied this Public License.

e. Licensed Rights means the rights granted to You subject to the terms and
conditions of this Public License, which are limited to all Copyright and
Similar Rights that apply to Your use of the Licensed Material.

f. Licensor means the individual(s) or entity(ies) granting rights under this
Public License.

g. Share means to provide material to the public by any means or process that
requires permission under the Licensed Rights, such as reproduction, public
display, public performance, distribution, dissemination, communication, or
importation, and to make material available to the public including in ways
that members of the public may access the material from a place and at a
time individually chosen by them.

h. You means the individual or entity exercising the Licensed Rights under
this Public License. Your has a corresponding meaning.

Section 2 – Scope.

a. License grant.

1.  Subject to the terms and conditions of this Public License, the
    Licensor hereby grants You a worldwide, royalty-free, non-sublicensable,
    non-exclusive, irrevocable license to exercise the Licensed Rights in
    the Licensed Material to:

    A. reproduce and Share the Licensed Material, in whole or in part; and
    B. produce, reproduce, and Share Adapted Material.

2.  Exceptions and Limitations. For the avoidance of doubt, where
    Exceptions and Limitations apply to Your use, this Public License does
    not apply, and You do not need to comply with its terms and conditions.

3.  Term. The term of this Public License is specified in Section 6(a).

4.  Media and formats; technical modifications allowed. The Licensor
    authorizes You to exercise the Licensed Rights in all media and formats
    whether now known or hereafter created, and to make technical
    modifications necessary to do so.

5.  Downstream recipients.

    A. Offer from the Licensor – Licensed Material. Every recipient of the
    Licensed Material automatically receives an offer from the Licensor
    to exercise the Licensed Rights under the terms and conditions of
    this Public License.

    B. No downstream restrictions. You may not offer or impose any
    additional or different terms or conditions on, or apply any
    Effective Technological Measures to, the Licensed Material if doing
    so restricts exercise of the Licensed Rights by any recipient of the
    Licensed Material.

6.  No endorsement. Nothing in this Public License constitutes or may be
    construed as permission to assert or imply that You are, or that Your
    use of the Licensed Material is, connected with, or sponsored, endorsed,
    or granted official status by, the Licensor or others designated to
    receive attribution as provided in Section 3(a)(1)(A)(i).

b. Other rights.

1.  Moral rights, such as the right of integrity, are not licensed under
    this Public License, nor are publicity, privacy, and/or other similar
    personality rights; however, to the extent possible, the Licensor
    waives and/or agrees not to assert any such rights held by the Licensor
    to the limited extent necessary to allow You to exercise the Licensed
    Rights, but not otherwise.

2.  Patent and trademark rights are not licensed under this Public License.

3.  To the extent possible, the Licensor waives any right to collect
    royalties from You for the exercise of the Licensed Rights, whether
    directly or through a collecting society under any voluntary or waivable
    statutory or compulsory licensing scheme.

Section 3 – License Conditions.

Your exercise of the Licensed Rights is expressly made subject to the
following conditions.

a. Attribution.

1.  If You Share the Licensed Material (including in modified form), You
    must:

    A. retain the following if it is supplied by the Licensor with the
    Licensed Material:

    i. identification of the creator(s) of the Licensed Material and any
    others designated to receive attribution, in any reasonable manner
    requested by the Licensor (including by pseudonym if designated);

    ii. a copyright notice;

    iii. a notice that refers to this Public License;

    iv. a notice that refers to the disclaimer of warranties;

    v. a URI or hyperlink to the Licensed Material to the extent
    reasonably practicable;

    B. indicate if You modified the Licensed Material and retain an
    indication of any previous modifications; and

    C. indicate the Licensed Material is licensed under this Public License,
    and include the text of, or the URI or hyperlink to, this Public
    License.

2.  You may satisfy the conditions in Section 3(a)(1) in any reasonable
    manner based on the medium, means, and context in which You Share the
    Licensed Material.

3.  If requested by the Licensor, You must remove any of the information
    required by Section 3(a)(1)(A) to the extent reasonably practicable.

4.  If You Share Adapted Material You produce, the Adapter's License You
    apply must not prevent recipients of the Adapted Material from complying
    with this Public License.

Section 4 – Sui Generis Database Rights.

Where the Licensed Rights include Sui Generis Database Rights that apply to
Your use of the Licensed Material:

a. for the avoidance of doubt, Section 2(a)(1) grants You the right to
extract, reuse, reproduce, and Share all or a substantial portion of the
contents of the database;

b. if You include all or a substantial portion of the database contents in a
database in which You have Sui Generis Database Rights, then the database
in which You have Sui Generis Database Rights (but not its individual
contents) is Adapted Material; and

c. You must comply with the conditions in Section 3(a) if You Share all or a
substantial portion of the contents of the database.

Section 5 – Disclaimer of Warranties and Limitation of Liability.

a. Unless otherwise separately undertaken by the Licensor, to the extent
possible, the Licensor offers the Licensed Material as-is and as-available,
and makes no representations or warranties of any kind concerning the
Licensed Material, whether express, implied, statutory, or other.

b. To the extent possible, in no event will the Licensor be liable to You on
any legal theory (including, without limitation, negligence) or otherwise
for any direct, special, indirect, incidental, consequential, punitive,
exemplary, or other losses, costs, expenses, or damages arising out of
this Public License or use of the Licensed Material.

c. The disclaimer of warranties and limitation of liability provided above
shall be interpreted in a manner that, to the extent possible, most closely
approximates an absolute disclaimer and waiver of all liability.

Section 6 – Term and Termination.

a. This Public License applies for the term of the Copyright and Similar
Rights licensed here. However, if You fail to comply with this Public
License, then Your rights under this Public License terminate automatically.

b. Where Your right to use the Licensed Material has terminated under Section
6(a), it reinstates:

1.  automatically as of the date the violation is cured, provided it is
    cured within 30 days of Your discovery of the violation; or

2.  upon express reinstatement by the Licensor.

Section 7 – Other Terms and Conditions.

a. The Licensor shall not be bound by any additional or different terms or
conditions communicated by You unless expressly agreed.

b. Any arrangements, understandings, or agreements regarding the Licensed
Material not stated herein are separate from and independent of the terms
and conditions of this Public License.

Section 8 – Interpretation.

a. For the avoidance of doubt, this Public License does not, and shall not be
interpreted to, reduce, limit, restrict, or impose conditions on any use
of the Licensed Material that could lawfully be made without permission
under this Public License.

b. To the extent possible, if any provision of this Public License is deemed
unenforceable, it shall be automatically reformed to the minimum extent
necessary to make it enforceable. If the provision cannot be reformed, it
shall be severed from this Public License without affecting the
enforceability of the remaining terms and conditions.

c. No term or condition of this Public License will be waived and no failure
to comply consented to unless expressly agreed to by the Licensor.

d. Nothing in this Public License constitutes or may be interpreted as a
limitation upon, or waiver of, any privileges and immunities that apply to
the Licensor or You, including from the legal processes of any jurisdiction
or authority.

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PCL Documentation and Specifications are licensed under CC BY 4.0
Copyright 2024-2026 PCL Contributors and IbIFACE

Applies to:

- All files in /SPEC (formal specifications)
- All files in /CORE (core concepts documentation)
- All files in /GOVERNANCE (governance documentation)
- All files in /docs (user guides, tutorials, API documentation)
- README.md and other root-level documentation files
