Linked below are the three SRDs in the Creative Commons that are most referenced on Full Moon Storytelling and in products by Dave Clark.
Those converting from a 5.1 SRD to 5.2.1 SRD now have this guidance including new names, new rules, revised rules, and omitted rules.
Wizards of the Coast provides this guidance on their SRD website.
The System Reference Document 5.2.1 (“SRD 5.2.1”) is provided to you free of charge by Wizards of the Coast LLC (“Wizards”) under the terms of the Creative Commons Attribution 4.0 International License (“CC-BY-4.0”). You are free to use the content in this document in any manner permitted under CC-BY-4.0, provided that you include the following attribution statement in any of your work:
This work includes material from the System Reference Document 5.2.1 (“SRD 5.2.1”) by Wizards of the Coast LLC, available at https://www.dndbeyond.com/srd. The SRD 5.2.1 is licensed under the Creative Commons Attribution 4.0 International License, available at https://creativecommons.org/licenses/by/4.0/legalcode.
Please do not include any other attribution to Wizards or its parent or affiliates other than that provided above. You may, however, include a statement on your work indicating that it is “compatible with fifth edition” or “5E compatible.”
Section 5 of CC-BY-4.0 includes a Disclaimer of Warranties and Limitation of Liability that limits our liability to you.
A5e from EN Publishing
Also released in the CC-BY-4.0, the full document can be found at A5ESRD.com.
Their Creative Commons guidance follows.
The A5E System Reference Document (A5ESRD) by EN Publishing is licensed under a Creative Commons Attribution 4.0 International License and is based on Level Up: Advanced 5th Edition, which can be found at at levelup5e.com.
You may use the content in the A5ESRD in any manner permitted by the license as long as you include the following attribution in your own work:
This work includes material taken from the A5E System Reference Document (A5ESRD) by EN Publishing and available at A5ESRD.com, based on Level Up: Advanced 5th Edition, available at www.levelup5e.com. The A5ESRD is licensed under the Creative Commons Attribution 4.0 International License available at https://creativecommons.org/licenses/by/4.0/legalcode.
Section 5 of CC-BY-4.0 includes a Disclaimer of Warranties and Limitation of Liability that limits our liability to you.
Black Flag
Kobold Press’ description of the Black Flag System Reference Document and its two licenses is below.
Black Flag Roleplaying is a free, open gaming system that enables anyone to play and create fantasy tabletop worlds, adventures, and sourcebooks under the Open Roleplaying Content (ORC) license and the Creative Commons license. Using the rules of 5th Edition SRD as a foundation, it allows for D&D gameplay with a modern update and includes new mechanics such as Luck and Talents.
Use their FAQ if you have questions about how to use Black Flag.
Full Moon Storytelling will only reference the Creative Commons version of Black Flag.
The Lazy GM’s Resource Document
Mike Shea’s guidance to the Lazy GM’s Resource Document is below.
This work is licensed under a Creative Commons Attribution 4.0 International License. You are free to use this content in any manner permitted by that license as long as you include the following attribution statement in your own work:
This work includes material taken from the Lazy GM’s Resource Document by Michael E. Shea of SlyFlourish.com, available under a Creative Commons Attribution 4.0 International License.
This work includes material taken from the System Reference Document 5.1 (“SRD 5.1”) by Wizards of the Coast LLC and available at https://dnd.wizards.com/resources/systems-reference-document. The SRD 5.1 is licensed under the Creative Commons Attribution 4.0 International License available at https://creativecommons.org/licenses/by/4.0/legalcode.
The publication and release of this document is made possible by patrons of Sly Flourish. Thank you for your support!
If I produce an SRD you will find it here
Full Moon Storytelling 