SharePoint Enable RMS Using Object Model

Step 1 Enable IRM on the farm

SPWebService svc = SPFarm.Local.Services.GetValue();
SPIrmSettings irmSettings = svc.IrmSettings;
irmSettings.IrmRMSEnabled = true;
//set true or false based on the situation
irmSettings.IrmRMSUseAD = true;
irmSettings.IrmRMSCertServer = "certificate server here";
irmSettings.IrmChanges = irmSettings.IrmChanges + 1;
svc.Update();



Step2 Set the IRM properties for a document library
SPSite site = new SPSite("http:////");
SPList spList = site.OpenWeb().Lists["list_name"];
SPFolder folder = spList.RootFolder;
spList.IrmEnabled = true; //corresponds to "Restrict permission to documents in this library on download"
// BELOW SET=2, RESET=0
folder.Properties["vti_irm_IrmPrint" ] = 2; // Allow users to print documents
folder.Properties["vti_irm_IrmVBA" ] = 2; // Allow users to access content programmatically
folder.Properties["vti_irm_IrmOffline" ] = 2; // Users must verify their credentials every nOfflineDays
spList.IrmReject = true; // do not allow users to upload documents that do not support IRM
spList.IrmExpire = true; //sto[ restricting permissions to documents in this library on expiry date
folder.Properties["vti_irm_IrmOfflineDays"] = nOfflineDays;
// integer representing number of days after which user needs to verify credentials
folder.Properties["vti_irm_IrmExpireDate" ] = dtExpire.ToString("r", CultureInfo.InvariantCulture);
// date on which to stop restricting IRM permissions to documents
folder.Properties["vti_irm_IrmTitle" ] = "Permission Policy Title";
folder.Properties["vti_irm_IrmDescription"] = "Permission Policy Description";
folder.Update();
spList.Update();