The placement of the work you have created in the public domain is a good contribution to the development of social forms of ownership and the development of the possibilities of social production as such. After all, after this, any person will be able to freely use your work to create a new one. Perhaps he will be inspired by your example and also place his new work in the public domain. Replenishing the treasury of the public domain, we thereby expand the possibilities of using the created works and accelerate progress by minimizing legal obstacles.
A popular tool that has been developed to discard its copyright and transfer the work into the public domain is the CC0 tool (CC Zero) developed by Creative Commons. This is a universal, worldwide tool. Only the copyright owner can use it. To use it, it is enough to indicate the connection of your work with CC0. You can also place a special tag on the product's webpage, informing users and search engines that your work is in the public domain.
Unlicense is another popular tool for translating a work into the public domain. To use it in conjunction with your work instead of the usual COPYING or LICENSE files, you need to place a UNLICENSE file containing a special “non-licensed” text informing you about the transfer of the work to the public domain and about the waiver of rights and responsibilities.
Additionally, it is worth mentioning the Public Domain Mark. Public Domain Mark is a special label that is placed on other people's works that are already in the public domain. It can not be used to release their own works, but it can mark the works of other authors, which are reliably known that they are in the public domain. Thanks to this tag, such works can be easily found through special search engines, for example, Google advanced search.This product is PUBLIC AND can be used AS-IS, with all the advantages and disadvantages, in whole or in part, by anyone and for whatever purposes WITHOUT ANY LIMITATIONS.
This is a product that has been used as a standard for IS, with WITHOUT ANY CONDITIONS.

Source: https://habr.com/ru/post/239523/
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