Dear Dr. Vishnu Kumar Gupta ,

Of course, I see that some can't upload due to the copyright issue.

Thanks a lot!

Dear Pro. Ivo Carneiro de Sousa

Thank you so much for relevant answer with your scenario.

Best

For some papers, authors may have no copyrights to publish publicly as copyrights have been transferred to the publishers.

Dear Dr. Sabri T. S. Ahmed ,

Thanks a lot for your good answer.

Sincerely

The reasoan for some are Copyright protection rights signed with the Conferences or Journals publishers. as Sabri mention above.

Several publishers do not allow the authors to upload their papers.

Regards

Several publishers do not allow the authors to upload their papers.

Regards

Dear Dr. Srete Nikolovski ,

Thanks a lot for your nice answer.

Best

Various and especially the well-known publisher prevent them to upload their papers on RG....it's a problem of copyrights

Many publishers prohibit the author from uploading the published version of the paper by the reason of the copyright but allow the author to upload the post-print (the last version of the manuscript) or the paper as included in the collected works of the author. So, I'm uploading my papers mostly in these forms.

This is difficult question

Some of sciencest don't have a copyrights, like Ivo said.

But (in my opinion), some of them don't wont to share their research in public. Only, if You ask (very politely).

Best regards

Maciek

This is mainly a copyright issue.

Hint for the authors: check how long the copyrights are running and supply once they run out!

(Depending on the publisher/journal, the copyright periods may vary from as short as 6 months to as long as 2-digits years.)

Dear Hassan Haes Alhelou ,

Thank you so much for your good answer, of course, there are several issues for it.

Best

Dear Dr. Kouider Khaled,

Sure, there may be copyright issues and policies with the well known, famous publisher.

Thanks!!!

Sincerely

Dear Dr. Tatsuo Tabata ,

Thanks a lot for your relevant answer.

Of course, we can upload the early view or pre-print.

Best

Dear Dr. Maciej Wawrzozak,

Sure, some authors don't want to distribute their research's findings. So, they didn't upload.

Sincerely

Dear Dr. U. Dreher,

Yes, I think, mostly, it is the copyright issue.

Best

Because of copyright issue and rules of publishing company

I think, this is due to copyright issue.

Copyright issues. I had uploaded 29 articles published in a single journal which were removed by RG upon journal‘s complain.

I agree with all the previous answers and add that some authors prefer to give the hyperlink for an article in open access that it's uploaded. Because it increases the number of readers in the Journal platform.

I think it is due to copyrights issues

Perhaps there articles was published in journals reserve copyright or not open accese

There are many factors like

*Copyright reserved.

*Scientific issue.

*They publish their efforts in other websites like their scientific institutions, Universities, centers.

it is due to copyrights issues

I follow answers

best regards

May be fear of copyright law for most of the closed access journals. Some journals request for as high as US30 before you can access a copy so uploading it on RG platform infringes on their rights as closed access journals.

Apart of issues of copyright reserved, some researchers do not like giving their full text for reasons best known to them. When you request for full text of such research items for may have to wait till eternity because they will not respond.

I am willing to upload but due to copyright issue I can't do. Most of the SCI Journals (peer reviewed Journals) are not open access.

Regards

It is due to copyright issue.

I think that the idea of belonging to a community like this, is to share knowledge, so the ideal is to have easy access to it, at least all my publications are public

Dear RG Colleagues,

Thanks a lot for your good answers.

Especially, I agree with Olutosin.

Sincerely

For many reasons: maybe due to copyright from journals, perhaps their future work has to do with that, maybe they love it so much they do not want to share, maybe they do not have it any more, etc.

This is sadly true, but there is nothing more rewarding than public exposure. By exposing ourselves to public scrutiny and criticism, we can improve our academic stance.

this is due to limitation from journal

When you signed the copyright from with any Journal or IEEE conference which are not open access, you are no more the owner of your paper. So that is the reason why the are not public. The is the rule we had to obey. You can get it in personnel correspondence with the author.

This is due to issue of copyright but I think you may send it any one privately on request.