With the release of Nitro PDF Pro v14.22 (and newer) for Windows, PDFs secured through FileOpen's Digital Rights Management can be opened directly in our Windows-based PDF editing software. 
A PDF with FileOpen encryption will open with a message alerting you that the file is protected via FileOpen's security protocols:
Please be aware that Nitro PDF Pro will adhere to all security settings applied to the PDF through the FileOpen encryption. When a file is secured with FileOpen, you will see a "Click here for options..." button on the notification popup. Clicking that will display the Document Properties window, showing you the security settings applied to the document. Nitro cannot override these security options. On the security tab, you will also see "FileOpen security" displayed in the drop-down list for "Security method". Conversely, if the PDF opened in Nitro PDF Pro is not encrypted or secured by FileOpen, the "FileOpen security" option will not be present here:
For additional support or to report issues:
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Submit a Support Ticket here: www.gonitro.com/support/ticket
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Post on the Community Forum here: Nitro Community Forum