Which version of my paper can I publish as open access?

You can include files in whatever format you prefer: applications, video, audio, etc.

However, we recommend that you use open formats to ensure the preservation of materials in the long term because they are based on open standards, free of legal and economic use restrictions.

In this regard for text documents we recommend the use of pdf format, not only because almost everyone can open PDF documents without having to buy any software, but also because Internet search engines retrieve perfectly the text of the documents in this format.

No, it is not possible for you to modify the documents already published in the repository.

Yes. Creative Commons licences are based on the idea of authors' rights. Recognizing the authorship of a work is essential. Using a Creative Commons licence for your final project simply means you're letting people who might want to use it do certain things with it.

Once you've chosen which Creative Commons licence you want to use, add it to the bottom of the front page of your work.

For example, if you choose the most restrictive Creative Commons licence, add the licence's logo, the copyright symbol, your name and surname, the year of publication and the legal text for the licence.