Thanks for that. Great link by the way and, yes, it would seem you cannot do any of the above (i.e. it isn't “for the purposes of non-commercial research or study, criticism or review, or for the reporting of current events”). Like yourself, I have been using screenshots for years especially in tutorials. It's hard to imagine Adobe suing someone for publishing materials that are helping others learn their software. I was interested in what was actually legal though and you have helped identify that.
So in the UK, pretty much everything is illegal without getting express consent. Things such as a screenshot of your OS X or Windows desktop and, say, creating one of those PDF icons that uses the Adobe PDF icon. I guess in writing a tutorial it could be argued that you're reviewing its capabilities and therefore all screenshots are considered fair use..
Good point regarding the Adobe logo…I have done a bit more research myself and as far as logos are concerned you just need to check with each company.
Adobe: http://www.adobe.com/misc/linking.html (Under “ADOBE PRODUCT ICONS” I find this ambiguous, what is your take on it?)
PHP: http://php.net/download-logos.php (Fine to use)
MySQL: http://www.mysql.com/about/legal/trademark.html (Fine but must link back to their site and annoyingly the logo has “Powered by” or “Includes” on it)
JQuery: http://jquery.org/about/ (Fine to use)
HTML 5: http://www.w3.org/html/logo/ (Fine to use)
CSS 3: Can't find a logo
Do you think it's reasonable then that whenever using a screenshot just add some small print saying who owns the software, that I am not affiliated with them?
EDIT: What is the law in creating icons based on protected brands. Take this icon, for example:
It may be a unique work in that is was created from scratch. However, it clearly resembles the Adobe Photoshop logo. Is that legal? There are hundreds of these “copies” around just on the PDF logo/icon alone.