The "trick" is to provide a so called draft instead of the paper you have in the IEEE/ACM format, I wrote so called because it's usually the exact same content

The "trick" is to provide a so called draft instead of the paper you have in the IEEE/ACM format, I wrote so called because it's usually the exact same content with a different formating. The only paper you are legally not allowed to share is the one with the publisher's template (LNCS/IEEE/ACM...). If you go to researcher's web page you'll find that most of them just upload a version without using the IEEE/ACM template on their public page to be on the safe side. However many people don't really care and upload the pdf from the proceeding even when they're not supposed to ;)