What version of the EMC IRM Client will work with Adobe Acrobat Standard DC?
According to the application's official website, IRM Client for PDF v5.1 SP2 works with Adobe 9.5, 10.1.2, 11 as well as DC 2015 and is compatible with Windows 7, 8, 8.1 and 10.
You can find it on this page: http://documentum.opentext.com/documentum-information-rights-managment/software/ and in order to download it, you will need to click on the language that you want it in. The product is pretty far down the page, so you will need to scroll down a bit.