About HI Secure PDFs
IMPORTANT UPDATE
On or about June 1, 2025 – the Hydraulic Institute will be improving our digital rights management (DRM) process. To learn more, click here.
HI Digital Standards, Guidebooks, and Guidelines are available as PDF files. These digital PDFs are a single-user encrypted product with a license granted by HI for single login on a single computer. The encrypted Digital PDF require both the Acrobat plug-in and the FileOpen Acrobat plug-in.
The end-user license prohibits installation of these files on a network server or their shared use in a network environment. These files may be transferred from an old computer to a new computer. For assistance, please contact our Support Center.